Problem with PETG  

Problem with PETG

Hi everyone!

I need some help or otherwise my printer will learn how to fly (out the window)... 🤯 

So the problem I am suffering is that there seems to be some kind of "deposit" being build up over time at the extruder area (don't know how to describe it in a more precise way) that is being released at random points - random in time and in space - finally ruining the whole print because the extruder gets caught directly and goes into error mode when it hits that blob/string or the surface gets messed up:

3mf file: Tools Stand v1-1.3mf

• Printer: Prusa MK4s - upgraded from MK3s and there I had the same problem already
• Filament: PETG generally, I tried both Prusament and FormFutura HDGlass, same or very similar outcome - Prusament seems to be slightly thicker/viscous when heated, that's the only difference I can observe
• The bigger the print area, the bigger the problem generally
• Problem appears at random places, sometimes halfway through the very first layer
• I tried playing with temperatures (both extruder and bed) to no avail
• I do have 35% humidity in my office, so that should not have a major influence (please correct if I am wrong here)
• Small objects (e.g. Benchy) look good, maybe not 100% perfect, but nothing that can't be fixed somehow

Any ideas on how to solve this are much appreciated!

Cheers... Pablo