Help perfecting my PETG surface finish
I'm getting very close to a clean surface finish with PETG, however I can't seem to get rid of zits in certain specific areas of my print. Because they are localized to the same areas of the print every time I print this job (rather than random blobs in random areas), I'm inclined to believe it's related to the anatomy of the print.
I am printing on two stock MK3s+ printers, with .6 E3D nozzles, and .30mm layer height. I am using Overture PETG, at 235C.
Things I have tried so far to eliminate the zits pictured (with no effect):
1) Reduced extrusion multiplier from 1.00 to .97
2) Set retraction length to .4 mm and retraction speed to 35mm/s. Also set lift height to 0. (Suggestions found in other threads)
3) Reduced temp from 240C to 235C.
Examining the features of my print in Slic3r, the zits do not correlate to retractions or deretractions. However they DO correlate to nozzle travel lines. So my theory at this point is that the nozzle is oozing a bit during travel, and as it crosses the perimeter of the print it deposits this ooze on the edge of the print. Does this sound correct? If so, what settings can I adjust to counter this? Thanks in advance!
Best Answer by josh.w3:
If anyone stumbles onto this and is facing a similar issue, I was finally able to get rid of these zits by making a few more minor adjustments:
Z lift height: 0.6mm
Retraction Length: 0.8mm
Extruder temp: 230C
Extrusion multiplier: 0.96
RE:
Was not able to attach my .3mf file for some reason, however here is a screenshot of the extruder travel lines that correlate to the zits in one area.
RE: Help perfecting my PETG surface finish
You have to zip up most files to attach them to a post. Including 3mf project files.
RE: Help perfecting my PETG surface finish
Ah, thanks. .3mf attached.
RE: Help perfecting my PETG surface finish
If anyone stumbles onto this and is facing a similar issue, I was finally able to get rid of these zits by making a few more minor adjustments:
Z lift height: 0.6mm
Retraction Length: 0.8mm
Extruder temp: 230C
Extrusion multiplier: 0.96