I have had trouble with a print, 3 try’s and it lifted off the bed every time. I have been using a new, too me, high speed type filament. I set the temp. to match the recommended ones for each print speed on the part. No Joy. I re-printed the same part with a different filament using my standard settings and while it only had a small lift it did separate on several layers. Two potential causes, new filament blues or my PEI bed is worn out. Is there any way to tell if the PEI is shot other then it not sticking any more??
What I finally did is to add mouse ears right in the CAD model and not in the slicer. The brims/ears that slicers add, even when the gap is set to 0.00, are not really attached to the print so the part can peel off the bed leaving the brim/ear behind. That isn’t a problem if they are actually part of the CAD model. Doing this ended any lifting problem I had, even on a long and narrow 11" x 1" print that would be a prime candidate for it peeling off the bed. The only down side is that you can’t peel them off, you have to cut them off.
I have not had any problems with parts lifting since I started this. Give it a try.
I would have thought that high speed filament would be fine with high speed cooling, but may be not.
Two approaches I can think of:
- Start your print with a bed temp of something like 50°C and then bump it up 5° every 25% in layer height (use a change at layer command and have temp rise 50, 55, 60 and then 65°C). If that seems too aggressive, try 54, 57, 60 and 63.
- Slow down your cooling fan.
Since I started to add the 'mouse ears (you could use a brim instead) right in the CAD part I have not had any problem with parts lifting of the bed so I am going to stick with that.
jus a general comment. PEI does wear out or sort of. When a sheet is having issues I will use a scrub brush and detergent (not soap) to clean it thoroughly. Sometimes I get a plate the will not stick and I will wet sand (gently) with 600-800 emery paper. That can help too. It might o not be related. It does sound like the design to see however. Some shapes ae just prone to peeling too much tension in he design.
That’s why I printed the long thin parts. These are the worst for lifting off the bed but with the built in “mouse ears” they are fine.
I will try cleaning the bed.