Prusament PETG Disasters - Help!
Hello!
I am beating my head against a wall trying to tune my prints with my MK3s and Prusament, advice would be great! Let me preface this by saying I have printed the Benchy and a Temperature tower with amazing results. Now, I am trying to print surfboard fins and keep having the issue below in the pictures of a filament blob appearing out of nowhere later in my print and completely nuking my print and the fin tipped over on the print bed.
Here are my current settings:
0.2mm layer height || 100% Infill || First and other layer print temperatures 235°C Print nozzle / 85°C Bed
All other parameters are standard from the Prusament PETG filament setting in the prusa slicer.
Note that my printer is not in an enclosure but is not in an area where air movement is common and I keep it at room temperature.
Any ideas on the culprit and or general adjustments you found work great from your Prusament PETG printing experiences?
Thanks!
RE: Prusament PETG Disasters - Help!
I can't tell from the photos, but is the surface with the blob the one that's intended to be the 'bottom', as in the one on the build plate, and is it supposed to be totally flat?
RE: Prusament PETG Disasters - Help!
That is difficult to tell. Booger from filament leak?
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Chuck H
3D Printer Review Blog
RE: Prusament PETG Disasters - Help!
Make picture on the bed, model how it is sitting on the bed,
and how many parts are printing at the same time.
RE: Prusament PETG Disasters - Help!
If you are getting persistent problems with odd globs of filament in your prints, remove the part cooling fan shroud and silicone sock (if using one), move the printer into good light and inspect the top of the heater block (that the nozzle threads into). Look for filament puddling at the top of the block or dripping down the sides. If present, that indicates your nozzle isn't properly tightened against the heatbreak inside the heater block.
If you're seeing a lot of filament crud on the underside and lower sides of the block & nozzle, your initial Live-Z setting may be a bit low for PETG. PETG does not require as much "squish" as PLA and the nozzle can pull bits up while printing the 1st layer, accumulating on the nozzle & heater block where they eventually fall off. If you were printing colors, you might see little black specks and blobs. IME, increasing (making less negative) Live-Z by 0.02-0.2 for PETG is usually sufficient.
If you're consistently getting those blogs at the bottom of prints, watch your 1st layer go down and make sure there isn't a string or blob of filament dragged around as the prime line prints. Looking at your Benchy print, that looks a lot like an errant blob that can form as filament oozes during warmup, and gets dragged around by the nozzle a bit before breaking off in the print somewhere.
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