Ridged /shifted corners - Why?
Hello Prusa forum. I printed a few small cuboids and noticed that the some of the corners were ridged / shifted. Does anybody know why this has happened?
Details:
- The problematic corners were all adjacent to another cuboid (see red areas on attached image).
- Printed with the 0.8n with filament add:north PETG (using the built-in Prusa Slicer settings for said filament).
- Printed on a MK4 with Input Shaper on the 0.40mm QUALITY layer height setting.
- I tried the same print whilst the printer was on a moderately stable table, and another identical print whilst the printer was placed on the floor: Same issue.
- I printed inside the Prusa Enclosure.
- I printed on a Prusa textured sheet.
Anybody have an idea? Or any idea of more info I didn't mention?
0.8mm nozzle and 0.4mm layers are never going to give high precision in small objects ... as a rule of thumb the best repeatable accuracy is about half an extrusion width which would be 0.5mm with that setup, yes, you can do better with tuning. How good are the same prints with 0.4mm nozzle at 0.2mm layer height?
Cheerio,
RE: Ridged /shifted corners - Why?
0.8mm nozzle and 0.4mm layers are never going to give high precision in small objects ... as a rule of thumb the best repeatable accuracy is about half an extrusion width which would be 0.5mm with that setup, yes, you can do better with tuning. How good are the same prints with 0.4mm nozzle at 0.2mm layer height?
Cheerio,
Just tried it, and those prints came out with all perfect corners. So I suppose it was a nozzle issue. Thanks!
But that's a bit sucky, does that mean that you can't ever rely on having nice 90° corners when using a 0.8n? That doesn't seem right!
RE: Ridged /shifted corners - Why?
A 0.8mm nozzle is going to be extruding about 1.2mm wide which means the minimum diameter of a corner is going to be 1.2mm so that is always going to limit your corner sharpness
RE: Ridged /shifted corners - Why?
A 0.8mm nozzle is going to be extruding about 1.2mm wide which means the minimum diameter of a corner is going to be 1.2mm so that is always going to limit your corner sharpness
Yeah, that makes sense! It was more the inconsistency I was confused about, why some corners were perfectly aligned and even and other corners were not. I don't really understand how that has something to do with the nozzle diameter, apart from the slicing code for 0.8n perhaps not being optimized.