Flashforge 3D Creator forum.

[caseless]

I'm at my wits' end. I keep running into problems with the corners curling on my prints.

I'm running a FlashForge Creator dual extruder (wooden frame). I'm printing in ABS with kapton tape and a ton of Aquanet.

I've tried the following things already:
Levelled the bed
replaced the kapton tape
tested at speed settings (40/70, 65/90)
tested with various heatbed temperatures
75C -> pretty bad lift
80C -> slightly less lift
85C -> about the same as 80C
90C -> only right side lifts
95C -> slightly worse than 90C, left and right side lifts
100C -> left and right sides lift
110C -> Good way to make a bowl

I've played around with the extruder temps as well. At 230C, the raft is pretty much fused to the bottom of the print, and there are some melty bumpy textured portions of the print. At 220C, the raft releases fairly cleanly with a little work and decent layer adhesion. At 210C I see a lot more lift from the print bed and get the occasional poor layer adhesion. In all cases it starts out looking great, but at some point between 11% and 26% complete, the corners lift and curl upwards.

I've tried using MakerWare and ReplicatorG with similar results, although MakerWare's rafts seem better and the slicer is MUCH faster for my model.

I'm trying to print a quadcopter arm. It is basically two boxes 1.5" wide by 1.5" high by 0.25" deep that are connected by a solid 5.5" cruciform span (a 5.5" X sandwiched between two plates). I've tried two different spools (both black) of ABS from two different vendors with similar results. I've tried insulating the printer (aluminum foil wrapped around cardboard and taped over the open sides, covered whole unit with blanket), and the results are similar.

Anyone have any suggestions for what to try next?

edit: Added 1" square "mouse ears" to the corners. Helped hold down one side. Added bigger ears to the other side, trying again. Will update with a status.

edit 2: tested twice with large "mouse ears". Still failed. Going to run one of the test prints that came with the printer to see if that is having problems too.