I print almost exclusively with ABS. Some parts pretty much max out the size capabilities of the bed. 12.5" part corner to corner. These size of parts are the most prone to warpage.
What works for me:
- Parts with high wall counts and/or thick top layers are most prone to warping. Avoid or model in relief cuts where possible.
- Where possible slice problematic parts to print per object vs a plate full of parts printing a full layer at a time. This seems to keep the individual part temp higher as they print and reduce warping.
- Lower layer heights seem to be more warp prone. Avoid sharp corner transitions where possible.
- Bambu ABS seems to warp less than other brands of ABS but be aware that it doesn’t acetone vapour smooth. Parts need to be dipped to smooth. Bambu ASA seems to have more warping and adhesion problems than Bambu ABS.
- Add a brim/mouse ears to long parts with a 0 object-brim gap.
- Make sure the plate is squeaky clean. Dawn and hot water. The Smooth/High Temp PEI sheet seems to have the strongest adhesion, followed by the Textured Plate. I don’t use glue.
- Preheat the chamber for warp prone/large parts.
- Set the bed to 100/120c
- Home the bed
- Turn on the Aux fan to blow across the bed
- Wait till the chamber temp (X1C) or stand alone temp display (P1S) hits 50c
- Avoid opening the printer door unless it is an emergency print intervention.
- I use the stock Bambu ABS profile. Chamber fan is off to keep the chamber temp as high as possible. I use a stand alone Hepa filter and the room air is exchanged via a HRV.
- Once the print completes I don’t seem to find the cooling rate affects the finished part. Removing the plate and flexing the parts to removed or letting them cool overnight in the printer seems to yield the same parts.
- Any white haze from the bed on the bottom of the part is removed with a stiff bristle brush.