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Prusa MK3S+ with Revo - how do I fix PETG blobs and filament sticking to the nozzle? (www.imgur.com)

submitted 1 year ago by [email protected] to c/[email protected]

7 comments fedilink hide all child comments

I'm glad this happened on the first layer of a 2-day print, at least.

I'm using Revo's recommended settings for PETG, on a 0.6mm nozzle, printed with Prusament PETG.

I haven't printed anything since July, and this is the second print in a week. The first print was mostly fine, but had some strange artifacts on one end of the print which I attributed to Octoprint acting up (I've since sanded them away so I don't have pictures). Just to be safe, I greased the smooth rods, checked the belt tightness, and re-ran XYZ calibration + first layer calibration.

I watched this whole first layer get put down - everything seemed to be absolutely fine, with a couple "zits" in one section (actually right next to where the blob landed; you can see them in the second picture).

The print head lifted up to start another section of the print and this massive glob of PETG fell off the hotend and landed right on the print, which forced me to cancel. Then I noticed a big ol' glob on the nozzle too (no idea where it came from). Trying to remove it broke the silicone sock.

I've ordered a new nozzle just in case this one is worn, but I'm curious if anyone has any ideas as to what could be the underlying issue here? My retraction length is 1.1mm with a retraction speed of 27 mm/sec.

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[–] [email protected] 1 points 1 year ago (1 children)

I have a MK3S and a MK3S+, one with a stock nozzle and one with a Revo. I print the same gcode on both machines and haven't seen a need to tweak the settings for the Revo. Have you tried slicing with the default settings for Prusament PETG in Prusaslicer?

[–] [email protected] 1 points 1 year ago* (last edited 1 year ago)

Yeah, originally I had kept all the settings stock but I was having issues with bed adhesion and stringing when I swapped to a different PETG brand. I played with my extrusion rate until that other filament (Overture PETG) printed mostly okay... but honestly that filament still gave me issues on the first layer (mostly edge curling on the bed) so I just ate the extra cost and swapped back to Prusament.

I suppose it probably couldn't hurt to try a print with all the stock settings just to rule things out.