The part above is my first more or less successful print with polycarbonate. This is part of a Yeti mug cap for a friend. While the part is useable, it just barely made it.
This is printed from Gizmo Dork PC, on my UM2+. On the first couple of attempts I tried using glue stick on the glass with no success; I would normally abort the print after 15 seconds. I then went to ABS juice, which seems to hold onto the PC pretty good. The first attempt with juice did not have a brim and about half way through it was warping so bad that I again aborted the print. On the print shown here I added a brim. The part is 2mm thick, so 10 layers, and during the 9th layer I felt pretty confident that this was going to turn out great, it appeared to be held down perfectly. But during the 10th (last) layer I could see that the edge was starting to lift and taking the inner half of the brim with it. As the print finished the outer edge of the brim was still attached to the glass. A few minutes later as the machine cooled down the part warped enough to lift the brim up all the way around.
The failure occurs in the bond between the ABS juice and the glass, as the PC and ABS appear to be fused together nicely. So are there any good tricks to get the ABS juice to stick to the glass better? I have thought of trying Kapton tape on the glass, but from what I have read it sounds like the tape will be lifted off the glass.  oes anyone know if the commercial products like Wolfbite hold to the glass better?
Print settings – 260 deg C extruder, 110 deg C bed, 0.4 mm nozzle, 0.2 mm layers, 30 mm/sec speed.