This is yet another post about bed adhesion difficulties. I searched this forum for advice and tried a few things but my current print is showing the same issue so I’m hoping this will yield some new ideas.
My setup is a KITTAZ w/ standard extruder and hot end and a 1/16" PEI sheet clamped onto the bed. I also have the dual duct fan installed on the hot end to keep air flowing around the heat sink. I have been using the silver PLA from Lulzbot. I like to use Simplify3D for slicing and have tried the following setting combos, all to similar effect:
- 190º head, 60º bed, 60mm/s default speed, 0.2mm layer height, 30% 1st layer speed, 120% 1st layer height, 100% fan
- 180º head, 80º bed, 60mm/s default speed, 0.14mm layer height, 35% 1st layer speed, 90% 1st layer height, 100% fan
- 180º head, 60º bed, 60mm/s default speed, 0.22mm layer height, 50% 1st layer speed, 90% 1st layer height, 100% fan
I’ve carefully checked three times that the bed is level. The prints come off with a gentle pull but seem fixed to the bed well enough. The curling never begins right away, but rather after the first few layers or even later. My (inexperienced) gut feeling is that this is mainly a temperature problem but I don’t know where to go with that hunch. I have made a handful of successful prints, but nearly all of them exhibit this problem to some degree. I’ve also experienced this when printing on the PET surface.
The photos are of a failed print of the Maker Faire articulated robot figure http://www.thingiverse.com/thing:331035.