OrcaSlicer Warping & Lifting Corners: Fixes That Actually Work (2026)

I lost a 14-hour ABS print last winter because of a single lifted corner. The part was a tool holder for my workbench, 180 mm long, printed on a P1S that I’d convinced myself was “basically enclosed enough.” Around layer 90, one corner popped off the textured PEI plate, the head dragged across the loose section, and by the time I noticed, the whole thing looked like a piece of toast that had argued with the toaster. I had skipped the brim because I “didn’t want to deal with peeling it off.” That print cost me about $9 in filament and the better part of an afternoon, and it taught me something every ABS user eventually learns: warping is not a slicer bug. It is physics expressing itself through a sticky surface that finally gives up.

If you’re reading this because corners on your prints are lifting, curling, or popping off the bed mid-job, I’ll save you the suspense up front. The fix is rarely a single OrcaSlicer toggle. Warping is primarily a thermal and hardware problem, and slicer settings help at the margins. That said, the margins matter, especially when you’re running a passive enclosure like the P1S or X1C, or trying to stretch ASA on an open-frame bedslinger. I’ve spent the last year breaking, rebuilding, and re-tuning prints on three different printers (P1S, X1C, and an enclosed Voron 2.4 with a PTC chamber heater), and what follows is the playbook that actually works. I’ll be clear about what’s a slicer fix, what’s a hardware fix, and what’s a myth that gets repeated on Reddit.

One more thing before we get into it. If you’re printing PLA and you think you’re seeing warping, you almost certainly aren’t. I’ll explain why later, but the short version is that PLA shrinks so little that “PLA warping” is nearly always a bed adhesion failure in disguise. Save yourself an afternoon and skip to the first-layer problems guide instead.

Table of Contents

• Why warping happens (the physics in plain English)
• Material warping ranking (which filaments curl, which don’t)
• OrcaSlicer settings that actually move the needle
• Hardware: the real fight
• Enclosure and chamber options
• Brim techniques in OrcaSlicer (the deeper playbook)
• Common false fixes
• Per-printer notes
• Worked example: dialing in ABS on a P1S
• FAQ

Why warping happens (the physics in plain English)

I want you to picture a single bead of molten ABS leaving the nozzle at around 260°C. It hits the cooling line below, fuses, and immediately starts shedding heat. As it cools, it contracts. The amount of contraction depends on the polymer, but for ABS, ASA, and PC it’s somewhere around 1.5 to 2.0 percent linear shrinkage. On a 100 mm part, that’s up to 2 mm of contraction trying to happen. Two millimeters doesn’t sound like much, but stretched across a corner with a few square centimeters of bed contact, it’s plenty of force to peel a lifted edge.

The chain of causation goes like this. Layer N goes down hot and bonds to layer N minus one. Layer N then cools and contracts. But layer N minus one has already cooled and is now rigid. So layer N, in shrinking, pulls layer N minus one inward. Repeat that fifty times and you have a stack of layers all trying to pull the corners inward. The stress concentrates at the perimeter, and especially at corners, because corners receive contraction force from two axes simultaneously. Eventually the cumulative force at one corner exceeds the bed adhesion at that corner, and that corner lifts. From the lifted corner, the failure usually propagates inward, sometimes catastrophically.

Two material properties decide whether this matters or not. The first is the glass transition temperature, or Tg. This is the temperature at which the polymer transitions from a rigid glassy state to a softer rubbery state. Above Tg, the polymer is ductile enough to dissipate stress by deforming slightly without losing dimensional integrity. Below Tg, stress is locked into the part as residual internal stress. ABS has a Tg around 105°C. PC is much higher, around 145°C. PLA is around 60°C, and PETG is around 80°C. Materials with high Tg trap more stress before they “freeze” into their final shape, which is why ABS, ASA, and PC are the materials that fight you hardest.

The second property is the coefficient of thermal expansion, or more practically, the shrinkage rate per degree of cooling. ABS, ASA, PC, and nylon shrink a lot. PLA and PETG shrink less. Carbon-fiber-filled variants like PLA-CF, PETG-CF, and PA-CF shrink less than their base resin because the fiber doesn’t shrink and mechanically restrains the matrix. That’s why CF-filled engineering filaments are often easier to print than their unfilled cousins, even though the matrix material is the same.

This is also why a heated chamber matters so much for the worst offenders. If you can keep the bulk of the print near Tg while subsequent layers are deposited, the lower layers stay ductile and dissipate the contraction stress instead of transmitting it to the corner adhesion zone. Drop the chamber temperature, and the lower layers go rigid, and now every new layer’s contraction force gets concentrated at the bed bond. That’s the moment corners start lifting. It’s why an enclosed printer with a chamber heater can print 200 mm ABS plates with a 3 mm brim and finish clean, while an open-frame Ender 3 with the same plate and a 10 mm brim will still curl. The slicer is identical in both cases. The chamber is doing the heavy lifting.

Material warping ranking (highest to lowest severity)

Before you fight your warping problem, it helps to know what you’re up against. Here’s the ranking I’ve settled on after a year of testing, cross-referenced against the Bambu Lab material table and a stack of community threads.

If you’re on ABS, ASA, or PC, the rest of this article is for you. If you’re on PLA and you’re seeing corner lift, you have a bed adhesion problem, not a warping problem. Common causes: dirty plate, first layer too high, too-cool bed (PLA prefers 60°C, not 50°C), or a part with a tiny footprint sitting on textured PEI without a brim. Read the first-layer troubleshooting guide instead of this one.

For PETG users seeing warping, the usual culprit is either too much fan on a tall print or a too-cool bed. PETG actually adheres extremely well to textured PEI, sometimes too well. If yours is lifting, look at the fan curve and the bed temperature before adding a 10 mm brim.

OrcaSlicer settings that actually move the needle

I’m going to walk through every setting in OrcaSlicer that meaningfully affects warping, in rough order of impact. None of these will save a 250 mm ABS plate on an open-frame Ender 3. But on a P1S or X1C, getting these right turns “occasional failures” into “reliable prints,” which is the realistic goal for passive enclosures.

Brim: the single biggest slicer-side win

Find it under Print Settings, Others, Skirt and Brim. In newer Orca versions (2.3 and later) there’s also a brim button in the prepare-tab toolbar that opens the same settings in a more visual way. The fields you care about:

• Brim type. Auto, Painted, Outer, Inner, Outer and Inner, and Mouse Ears. I’ll cover when to use which in the dedicated brim section below.
• Brim width. Distance from the model outline to the outermost brim line. For ABS and ASA, I run 5 to 8 mm. For PC and nylon, push to 8 mm and add ears at corners.
• Brim-object gap. Gap between the innermost brim line and the model itself. For warp-prone materials, set this to 0 so the brim bonds maximally to the part. For PETG (where you want the brim to peel off cleanly) set this to 0.1 to 0.15 mm.
• Ear max angle. Only relevant if brim type is Mouse Ears. Angle threshold below which a corner is considered “sharp enough” for an ear. I run 140 to 160° on most parts. 180° puts ears almost anywhere non-straight, which is overkill.
• Ear detection radius. Minimum deviation length for the corner detection pass. 0 disables.
• Brim flow ratio. Available in Orca 2.3.2 and later. Multiplier on brim extrusion. Push it slightly above 1.0 (try 1.05 to 1.10) to mash the brim into the bed for stubborn ABS.
• Combine brims. Also 2.3.2+. Merges adjacent brims into continuous loops, useful for tight cluster layouts.
• Brim use EFC outline. Aligns the brim with the first-layer perimeter after Elephant Foot Compensation. Prevents a brim-to-wall gap when EFC is active. Turn this on.

One bit of trivia worth knowing: the Auto brim option caps at 20 mm and skips generating brim entirely if its computed width comes out under 5 mm. That’s documented in the Orca wiki. So if you’ve set brim type to Auto and you’re getting no brim, that’s why. Switch to Outer with an explicit width.

First-layer cooling: turn the fan off

Find it under Filament Settings, Cooling. The relevant fields:

• Close fan the first X layers. Internally named close_fan_the_first_x_layers in the profile. For ABS and ASA, set this to 3 to 5 layers. For PETG, 1 to 2. For PC and nylon, leave the fan effectively off for the entire print.
• Full fan speed at layer. The fan ramps from zero to maximum linearly between Close fan the first X layers and this value.
• Fan speed. The maximum the fan reaches. For ABS and ASA, 0 to 20 percent. For PETG, 30 to 60. For PLA, 100. For PC and nylon, 0 to 10.

This is the single most common ABS warping fix that gets ignored. Cooling fans are the enemy of warp-prone materials. If your part-cooling fan kicks on at layer 2 and ramps to 50 percent by layer 10, you’re aggressively cooling the upper layers while the lower layers are still trying to stabilize. That accelerates the contraction differential and concentrates more stress at corners. Turn the fan off. Yes, your overhangs will look slightly worse on ABS. They’ll look much worse if the whole part curls off the bed.

First-layer line width and height

Find these under Print Settings, Quality. Line width is in its own subsection, layer height in “Layer height.”

• Initial layer line width. Orca exposes this as a percentage of nozzle diameter or an absolute mm value. For warping-prone materials, push to 110 to 120 percent of nozzle diameter. This squishes more material onto the plate per pass and increases bond area without you having to mess with z-offset.
• First layer height. Bump to 0.24 to 0.30 mm for a 0.4 mm nozzle. Thicker first layer is more forgiving of small bed level variations and gives you more thermal mass against the plate.

A quick note for anyone coming from PrusaSlicer: PrusaSlicer has a dedicated “First layer flow ratio” field. OrcaSlicer does not have an equivalent single-field control today. There’s an open feature request on the Orca repo (issue #11000) to add one. Until that lands, the pragmatic workaround is the combination above: bump initial layer line width, increase first layer height. Don’t push line width above 150 percent or you’ll get over-extrusion blobs that ruin the first layer in a different way.

First-layer speed

Find it under Print Settings, Speed, Initial layer speed. Slower first layer means more time for the bed to thermally bond each line. For ABS, drop to 20 to 30 mm/s on the initial layer. Default Orca profiles often sit at 50 mm/s, which is too fast for stubborn ABS.

I run my P1S ABS profile at 25 mm/s first layer. It costs about a minute on most prints and pays for itself by not requiring me to redo them.

Bed temperature: hold it, don’t drop it

Find it under Filament Settings, Filament, Temperature. Two fields:

• Bed temperature, initial layer. First-layer-only target.
• Bed temperature, other layers. Sustained target through the rest of the print.

For warping-prone materials, set both to the same value. Do not drop the bed mid-print. Some users drop the bed by 5 to 10°C after the first few layers to reduce elephant foot on PLA, and that’s fine for PLA. Do not carry that habit to ABS, ASA, or PC. The shrinkage happens whether the bed is hot or cold. A hot bed keeps the lower layers ductile so they don’t transmit force to the corner adhesion. Cool the bed and you’re shooting yourself in the foot.

Reasonable bed temps by material:

• ABS: 95 to 110°C (I run 105 on textured PEI).
• ASA: 95 to 110°C.
• PC: 105 to 115°C.
• Nylon: 70 to 90°C (varies by grade).
• PETG: 70 to 80°C.
• PLA: 55 to 65°C.

For chamber-less printers like the P1S, A1, or any Ender, the bed is also your chamber heater. Preheat the bed for at least 15 minutes before the print starts so the chamber can soak. This is Bambu’s own guidance for the P1S and X1C, and it matters more than people realize. Starting a print on a cold chamber is starting one round behind.

Chamber temperature field

Find it under Filament Settings, Filament, Chamber temperature, but only if your printer profile supports it. This field behaves differently depending on hardware:

• On the Bambu X1E, this field actively heats the chamber to the target. The X1E ships with an active PTC chamber heater capable of holding 60°C.
• On printers without an active heater (P1S, X1C, A1), the field is treated as a wait condition. If a chamber thermistor is present, the firmware waits until the chamber reaches the target before starting. If there’s no thermistor, the field is informational only.
• On Voron and Klipper-based machines with community chamber heater mods and a chamber thermistor configured, the field behaves like the X1E.
• On Qidi machines with active chamber heating (X-Plus 3, X-Max 3, Plus 4), it controls the chamber heater up to the manufacturer’s limit.

I won’t quote a chamber temp for the X1C or P1S because neither has active chamber heating and the actual realized chamber temperature depends on bed temperature, ambient room temperature, door state, and how long you soaked. Don’t trust anyone who gives you a single number for a passive chamber.

Draft shield

Find it under Print Settings, Others, Skirt, Draft shield. Two modes: Disabled and Enabled. When enabled, Orca prints a thin skirt wall up to a configurable height around the model. It acts as a passive heat trap that holds warm air near the print, which helps on open-frame printers.

One verified caveat. The draft shield in Orca and Bambu Studio doesn’t generate its own brim, so the shield itself sometimes lifts away from the bed during the print and ruins the trap. The workaround is to set skirt distance to around 5 mm and brim width to around 10 mm so your part’s brim flows under the shield base. There’s an open Orca issue (#1630) requesting a native “draft shield with brim” option, but as of this writing it isn’t implemented.

Draft shield is a useful tool for open-frame printers. It is not a substitute for a real enclosure. If you can enclose, enclose.

Hardware: the real fight

I want to be honest with you about something. I spent a long time trying to slice my way out of ABS warping on a P1S. I tuned brims, I dropped the fan, I bumped initial layer line width to 120 percent. The prints got better. They did not get reliable. What actually moved my P1S ABS workflow from “best effort” to “set it and walk away” was a $40 ETSY draft door seal kit that closed up the air gaps around the P1S top glass and front door, plus a habit of preheating the bed to 105°C for 20 minutes before every ABS print. The chamber temperature was the variable I was missing.

Here are the hardware levers, ranked by effectiveness on the materials that actually warp.

1. Heated chamber. Singular biggest factor for ABS, ASA, PC, and nylon. Keeps the print bulk near Tg, lets stress dissipate before it concentrates at corners. The Bambu X1E ships with this (60°C active). Voron with a PTC chamber heater is the DIY gold standard. Qidi X-Max and X-Plus 3 also have active chamber heaters.
2. Passive enclosure. Traps the bed’s radiated heat. Will get a P1S, X1C, or IKEA-Lacked Ender 3 into the 35 to 50°C range depending on bed temperature and ambient room temperature. Sufficient for ASA and most ABS, marginal for PC, and not enough for nylon-class materials.
3. Bed surface. Textured PEI is my default for ABS. No glue needed in most cases, ABS bonds well to the texture and releases when cool. Smooth PEI works on ABS but bonds too well, and prying ABS off smooth PEI risks chipping the PEI coating off the spring steel. If you must use smooth PEI for ABS, use a glue stick or Magigoo as a release agent. Glass plus glue stick is the old-school combo and still works, but I’d take textured PEI over it every time.
4. Magnetic flex plate vs glass. Functionally similar for warp prevention. Flex plates are more forgiving for part removal because flexing pops the part off, but the slight elasticity can let a tall warping force “ride” the flex. Glass is more rigid and once it lets go, it lets go all at once. For 99 percent of users, the experience difference is in removal, not in warp prevention.
5. Draft shield (printed). Helpful on open-frame printers. A distant fourth behind a real enclosure.
6. Ambient room temperature. Free 5°C of chamber temperature if you can avoid printing next to an AC vent or a drafty window. Always worth doing.

For the ABS-specific hardware setup, the ABS and ASA filament settings guide has the temperature stack I use on each printer. For PC, the polycarbonate settings article walks through chamber requirements in more detail.

Enclosure and chamber options

The right enclosure for you depends on the printer you already own and the materials you want to print. Here’s the realistic landscape.

A few clarifications. The Polybox and Polydryer are dry storage boxes for filament. They are not print enclosures. People conflate them online, but they serve different purposes. For nylon and PA-CF, a dry box for spool storage plus a real heated chamber for printing is the combo. The dry box prevents moisture absorption between prints. The chamber prevents warping during the print. Don’t try to substitute one for the other.

The IKEA Lack hack deserves a specific mention. Two Lack side tables stacked, with acrylic or polycarbonate panels covering the four open sides, gives you a serviceable passive enclosure for under $80 if you already own the printer. It works on Ender 3 class machines and similar. Not as good as a P1S, but a real upgrade over open-frame.

Brim techniques in OrcaSlicer (the deeper playbook)

I’ve covered the basic brim fields above. Now the practical playbook: when to use which brim type, what width to set, and how to handle the brim-object gap.

Recommended brim widths by material

These are my working numbers, refined over a year of tuning:

• PLA: 0 to 3 mm. Most prints don’t need a brim at all on a clean textured PEI plate.
• PETG: 3 to 5 mm. Be careful, PETG brims can bond too well. Set brim-object gap to 0.10 to 0.15 mm so you can peel cleanly.
• ABS / ASA: 5 to 8 mm outer brim, or mouse ears with the ear width set to 5 to 8 mm at corners.
• PC / nylon: 8 mm outer brim plus ear-style additions at corners, plus an enclosure that’s actually doing something.

Brim-object gap by material

• PLA / PETG: 0.10 to 0.15 mm. You want the brim to peel off cleanly without scarring the part.
• ABS / ASA / PC: 0 mm. You want maximum bond between brim and part to fight the warping force. The cleanup is more work, but the print succeeds.

Painted mouse ears (Orca 2.3 and later)

Painted mouse ears arrived in Orca 2.3.0 Beta 2. You enter the prepare view, switch the brim type to Painted, and click on the part to drop ears exactly where you want them. The benefit is for parts with chamfered or rounded corners that don’t trigger the auto angle detection but still warp. Print a tall ABS box with a 5 mm corner chamfer using Mouse Ears (auto) and the angle threshold will skip those corners entirely. Switch to Painted and you can manually anchor the four corners and any other lift-prone spots.

I use this feature on enclosure parts with rounded outer corners almost every time. The auto angle detection just doesn’t catch them, and painted ears solve it in 30 seconds.

Raft: when to use it (rarely)

Raft is overkill for warping. The bottom-surface penalty is severe (the underside of the part is now the top of the raft, which is rough), and the print time hit is significant. Use raft when:

• Your bed is uneven and you can’t relevel.
• The part has a tiny footprint and warps. Like a tall thin ABS finial standing on a 10 mm square base.
• You’re printing on a surface the material doesn’t normally stick to.

Otherwise, brim or mouse ears. Almost always.

Common false fixes (and what to do instead)

These are the bad fixes I see recommended over and over on Reddit and forums. They sometimes work by accident, and they sometimes make the problem worse. Either way, they’re not the right answer.

Per-printer notes

The right answer for warping depends heavily on what you’re running. Here’s what I’d tell a friend depending on their printer.

Bambu X1C

Carbon-enclosed CoreXY with passive chamber heating via the bed. No active chamber heater. The chamber temperature you can realistically achieve is a function of bed temperature, ambient room temp, and how long you soak before printing. Bambu’s own guidance is to preheat the bed at maximum and wait around 15 minutes before starting.

Verdict: handles ABS and ASA cleanly. PC works on small to medium parts with mouse ears and clean textured PEI. PA-CF works with caveats. For more on dialed profiles, see the X1C and P1S setup article.

Bambu P1S

Same enclosure shape as the X1C but no AMS in the base config and no chamber heater. Passive chamber. The realistic warm-up follows the same pattern as the X1C, just with slightly lower passive chamber temperature because the X1C’s beefier mainboard and AMS hub radiate some heat.

Verdict: ASA is reliable. ABS works on small to medium parts, marginal on flat baseplates over 150 mm without sealing air gaps. PC is a stretch on the P1S. Many P1S users add a community chamber heater mod, which is the same physics that ships in the X1E. The P1S and P1P guide walks through the realistic envelope.

Bambu X1E

Active 60°C PTC chamber heater. The gold standard out-of-box option for engineering filaments. ABS, ASA, PC, PAHT-CF, PPS-CF all work with stock profiles. If you’re printing engineering parts professionally and you don’t want to DIY anything, the X1E is the answer.

Bambu A1 and A1 mini

Open frame, no enclosure. Don’t fight ABS or ASA on these. Stick to PLA, PETG, and TPU. If you absolutely must try ASA, use a draft shield in the slicer, a Polybox-style dry box for the spool, and accept that warping will be a near-certainty on anything over 80 mm.

Open-frame bedslingers (Ender 3, Kobra 2, Sovol SV06, etc)

No enclosure stock. Bed slings on the Y axis so even a passive enclosure is awkward because you have to leave room for bed travel. Verdict: PLA and PETG are the happy place. ABS works only with an IKEA Lack hack or equivalent enclosure, bed at maximum, glue stick if needed, and mouse ears. Even then, parts over 150 mm are coin flips. If you’re serious about ABS, upgrade your printer instead of fighting the bedslinger.

Voron Trident / 2.4

DIY enclosed CoreXY. Most builders add a PTC chamber heater (sub-$50 mod, well documented in the Voron community). With the heater installed, you can hold 50 to 60°C chamber comfortably. The community upper bound is around 80°C before belts, bearings, and printed parts in the printer itself start to degrade. Stay under that.

Verdict: gold standard DIY for ABS, ASA, and PC warping resistance once the chamber heater is in. Without the chamber heater, still better than open-frame because the enclosed volume holds bed heat.

Qidi X-Plus 3, X-Max 3, Plus 4

Active chamber heaters, with upper limits that vary by model. Check the specific model’s spec on Qidi’s site. Generally, these are alternative options to the X1E for engineering filaments. Worth considering if you want active chamber heat without going to Bambu’s flagship price tier.

Worked example: dialing in ABS on a P1S

Let me walk through exactly what I run on my P1S for ABS. This isn’t theoretical, this is the profile that’s been printing reliably for me for about six months.

Filament settings:

• Nozzle temperature, initial layer: 260°C. Other layers: 255°C.
• Bed temperature, initial layer: 105°C. Other layers: 105°C. Held constant.
• Chamber temperature: I leave this blank because the P1S has no active heater and no thermistor in stock config. I preheat the bed manually for 20 minutes before starting.
• Cooling: Close fan the first X layers = 5. Full fan speed at layer = 15. Fan speed maximum = 10 percent.

Print settings:

• Initial layer speed: 25 mm/s.
• Initial layer line width: 110 percent (so 0.44 mm on a 0.4 nozzle).
• First layer height: 0.28 mm.
• Brim type: Mouse Ears for parts with sharp corners, Outer for round/curved parts.
• Brim width: 6 mm.
• Brim-object gap: 0.
• Ear max angle: 150°.

Workflow:

1. Set bed to 105°C from the printer touchscreen, close the door and the top glass, and walk away for 20 minutes. This is non-negotiable for ABS on a P1S. If you start cold, you’re already losing.
2. Clean the textured PEI plate with isopropyl alcohol if it’s been a while. Skip soap and water for ABS unless the plate is visibly oily.
3. Slice the part with the profile above. For parts with rounded corners, switch brim type to Painted and click ears at each corner.
4. Send the print. Watch the first layer through the front glass. If a corner is even slightly translucent or grey-rather-than-shiny, the bond is weak, and you should consider canceling and restarting with more squish (lower z-offset by 0.02 mm).

Failures on this profile, for me, are now almost always one of three things: I forgot to preheat the chamber, the plate was dirty, or I’m trying a part with a footprint smaller than 30 mm by 30 mm without mouse ears. All three are operator errors, not slicer problems.

When warping still persists

If you’ve got the chamber soaked, the brim on, the fan off, and the bed at 105°C, and corners are still lifting, there are a few less-obvious things to check:

• Filament moisture. ABS and ASA absorb moisture from the air over weeks. Wet filament prints poorly and warps worse than dry. Dry the spool at 65°C for 6 hours in a filament dryer or food dehydrator. If you don’t have one, a Polybox or Sunlu S2 is around $50 and worth it.
• Room ambient. Printing next to an open window in winter or under an AC vent in summer drops your effective chamber temp by 5 to 10°C. Move the printer, or seal the door and vent.
• Part orientation. Sometimes rotating the part 45° on the bed reduces the longest contraction axis and helps. Try it.
• Splitting the part. If the part is over 200 mm and you’re on a passive enclosure, consider splitting it into two halves and bonding with acetone (ABS) or chemical adhesive. Two 100 mm halves warp far less than one 200 mm part.
• Plate condition. Textured PEI loses tooth over years. If yours has a noticeable smooth patch in the center where you always print, the bond is weaker there. Flip to the other side, or replace.

FAQ

Will PLA warp?

Almost never. PLA shrinks so little that on prints under 150 mm, warping is essentially a non-issue. If you’re seeing PLA “warp,” you almost certainly have a bed adhesion issue: dirty plate, first layer too high, bed too cool, or a part with a tiny footprint on textured PEI without a brim. Read the first-layer problems guide instead of treating it as warping.

Do I need a heated chamber for ASA?

No, but you do need an enclosure. ASA prints fine in the passive chamber of a P1S or X1C, and you can even get it to work in an IKEA Lack hack on an Ender 3. Active chamber heating helps but isn’t required for ASA in the way it’s required for PC.

Is raft better than brim for warping?

Almost never. Raft is overkill for warping, it doubles or triples print time, and the underside of your part will look rough. Use raft only when the bed is uneven, the part has a tiny footprint with a tall thin geometry, or you’re printing on a surface the material doesn’t normally stick to. Otherwise, brim or mouse ears.

Should I drop bed temp mid-print to release stress?

No. Cooling the bed makes the lower layers rigid, which concentrates contraction force at the corner adhesion zone. Hot bed equals ductile lower layers equals stress dissipation through deformation rather than corner lifting. Hold the bed at the target temperature for the entire print on ABS, ASA, PC, and nylon. The bed-drop technique applies to PLA for elephant foot reduction, not to warping prevention on engineering filaments.

Can I print ABS on an open-frame printer?

Technically yes, practically not well. You can get small ABS parts (under 80 mm) to finish on an open-frame printer with a big brim, glue stick, and a draft shield. Anything larger is a coin flip. The right answer is to add an enclosure (IKEA Lack hack works) or upgrade to an enclosed printer.

What about Bambu’s liquid glue?

Bambu’s own liquid glue is a verified product, and it’s similar in composition to a standard PVA glue stick. On smooth PEI, it works as a release agent for ABS and other strong-bonding materials. On textured PEI, it’s usually unnecessary. Don’t use it on cool plates, apply it warm, and clean the plate between coats so you don’t build up a thick layer.

Does brim flow ratio actually help?

Yes, modestly. Pushing brim flow to 1.05 or 1.10 mashes the brim into the bed more aggressively, which improves bond. Don’t push it above 1.10 or you’ll get over-extrusion at the brim that ruins removal. Available in Orca 2.3.2 and later.

Why do my brim corners lift but the rest of the brim stays down?

Because corners are where the contraction force concentrates. The brim across the long edges is sharing the force across more area, and the bond there is enough. The brim at the corners is fighting the same total force in less area. Solutions: more brim width specifically at corners (mouse ears), or higher chamber temperature so the part itself contracts less.

Does ironing the first layer help?

Not really. Ironing the first layer would just create excess heat in a region where you want the line to bond to the bed, not glaze over itself. Skip it.

Wrapping up

Warping is one of those problems that feels mysterious until you accept what it actually is: a thermal phenomenon that slicer settings can mitigate at the margins, but only hardware (chamber, bed, surface) can solve at scale. If you take three things away from this article, take these. First, the fan is your enemy on warp-prone materials, so turn it off. Second, the brim is your friend, and mouse ears are better than a full brim for most cases. Third, the chamber is doing more work than you think, and 20 minutes of bed preheat before an ABS print is worth more than any slicer toggle you can change.

For the slicer-only side of the equation, the brim, raft, and skirt guide goes deeper into the brim-specific fields. For material-specific guidance, the ABS and ASA settings guide, the polycarbonate settings article, and the nylon and PA settings guide walk through dialed-in profiles per material. If you’re on Bambu hardware specifically, the X1C and P1S setup guide and the P1S and P1P guide cover printer-specific details. And if your problem turns out to be a first-layer adhesion issue and not real warping, head over to the first-layer problems article or the broader OrcaSlicer troubleshooting guide.

Now go preheat your bed.

Related OrcaSlicer guides

• OrcaSlicer Troubleshooting: Master Index of Every Common Fix
• OrcaSlicer Settings Not Saving: Diagnose the Profile Reset Bug
• OrcaSlicer Layer Shifts: Causes, Diagnostics, Fixes (2026)
• OrcaSlicer Over-Extrusion, Blobs & Zits: How to Fix Them (2026)
• OrcaSlicer Cornering & Junction Deviation Calibration (2026)