Hey, Recently I got a heated bed and I've been trying to print ABS and my extruder skips on speeds higher than 35-40mm/s. This results in a temporarily under extrusion which shows like a missing layer on the prints. I'm able to print PLA at 75-80mm/s with ease and good quality, so I'm wondering why I can't do the same with ABS or PETG? I'm using this extruder: http://www.thingiverse.com/thing:275593/ I tried a range of temps from 215 to 242 for ABS and the extruder always skips on higher speeds like 50-60 etc... I can print ok at about 35mm/s, but even then it sometimes skips but it is VERY rare at that speed. My filament is measured and set at 1.8mm in the settings. My nozzle is 0.4mm. Edit: btw I'm not sure if skipping is the right term so I'm just gonna explain what happens exactly. What I mean by "extruder skipping" is that the extruder jumps back and forth for a few seconds and the filament doesn't move. It looks like filament doesn't have any room to go forward, which makes all this happen. Thought a photo might help: This was done at 40mm/s and I even reduced the speed by 15% half way through and it still didn't help. It wasn't this bad yesterday, I was able to print fine at 40mm/s.