avh

Thanks. The build platform was calibrated too close. It was causing a real messy first layer.

I'm having trouble printing the first layer. I just got my UM2, I've updated cura and the firmware, leveled the bed. During the first layer the feeder seems to suddenly retract the material a few mm, resulting in an incomplete print, and a mess. It is as if the feeder retracts because there is too much pressure in the nozzle. Is that even possible? I tried printing with retraction turned off, but that did not help. Lowering the material flow to 50% helped, but that does not seem the right thing to do... Has anyone seen this?