I’ve been printing a bunch of white panels, with PETG-GF filament. The results look great, except that I’ve noticed occasional black spots on the bottom of the print. I figured that there must have been some contamination or dust and just ignored the problem.
This time, I took a picture and see that there’s actually some kind of “blob” of plastic on the top side. You can see the dark discoloration in the image, but it also shows that something has caused a mysterious buildup of plastic in this area. This photo was taken around layer 4 or 5.
I think this might be happening regularly, but I’m just seeing this now because I happened to snap a picture when the printer was on a low layer. I didn’t realize this was happening in the past because I think this mistake normally gets covered over with the higher layers.
Any ideas what might be causing this problem?
Most likely some old filament came loose from the nozzle.
Also, I have noticed from my own prints…if the filament is from a cardboard spool, sometimes cardboard will stick to a piece of filament.
Thanks for your replies. @mich0111 what further information can I give you? The filament is CHCKX PETG-GF. Bed temp was 70C, nozzle is 255. I’ve increased bed temp to 80 to see if that helps.
@Lion thanks for the tip. The particular spool for the CHCKX filament is plastic.
Like both @mich0111 and @Lion mentioned temperature/contamination.
I have a Sovol Zero, not a SV06, but worth a look. It could be build plate contamination left behind after the nozzle cleaning stage. I’ll see zits of plastic blob, sometimes string, that oozed out where the head parks before and after cleaning. Try lowering the temps a bit and see if helps.
@MikeHides Oh, lower the temps? Which one: bed, nozzle, both?
I noticed that small contaminates can affect higher layers and turn into bigger blobs. Sorta like mountains out of molehills. Maybe the glass fibers are adding to this problem? I’m printing with a 0.4mm nozzle even though 0.6 is typically recommended since Sovol doesn’t sell a hardened 0.6 directly.
Filament with fibers are EXTREAMLY prone to stringing. If the string stays with the nozzle it starts a fuzzball, eventually the fuzzball comes loose and gets ironed into the print. Largish Z hops help (but don’t fix) the issue.
