jimc wrote:Jm, what are you using on the glass to help adhesion?
Nothing. Here are the things that I do:
General prep --
1] Clean the bed with windex
2] Wipe the bed with a microfiber cloth
3] Level the bed extremely well with feeler gauges (left,right,up,down, then diagonals)
4] Measure my bed distance with feeler gauges, compensate for my layer height, and set an Z-axis offset that matches in the G-Code settings tab
For a print --
1] Bring the room temperature up to 80-85F
2] Wipe the bed with a microfiber cloth (but not hard enough to alter the leveling)
3] 2-layer raft at 50% infill
4] Manually stabilize the bed temperature at 110C
5] Manually stabilize the extruder temperature at 220C (overshoots, falls, then slowly works up to the correct temperature)
Some of this may be overkill, I'm sure. Often times I don't even need the raft. But I use it if I am printing something very vertical or if I've got tiny little pieces on the bed which a fast swipe of an extruder nozzle could knock around. For that same reason, I've also lowered my XY speeds by 25% and I'm noticing a lot less knocking sounds during the rapids.
This print was a little unusual in that I noticed an artifact during printing. I was really close to the bed, it seemed, and an irregularity in the borosilicate glass became visible. No problem though. It all smoothed out on the next layer of the raft.