Any tips on how to improve the print quality of this keychain (just for info 3x4cm)? The first layer looks awful, and I have no idea why there are such sharp corners on the right side. The text under the opening also looks terrible.
Setup:
0.2mm nozzle (switched because the keychain is pretty detailed + has small text)
Bambu PLA Matte filaments
Arachne wall generator, only one wall on first layer, infill wall overlap 100%
The filament has been dried for many hours in a dedicated dryer, also did calibrations
That looks like it didn’t print any wall at all, only infill. In the print preview, you can go down to the first layer and then step through the print sequence for that layer with the bottom horizontal slider. Do you see anything suspicious there?
Did you print only one layer? I have had prints that start looking a bit ugly but once all the colors are in place and a few layers added, the ugly parts seem to melt into the surrounding plastic. It seems that the part is chamfered which could affect the first layer outerwall
Another idea is the layer height. When I use a 0.2mm nozzle, I set the layer height at 0.1mm, half the standard height of 0.2mm for a 0.4mm nozzle.
I totally agree, that only printed the infill and no wall, so start there.
I would also suggest washing the print bed, as some of your problems look like they could be made worse with bad adhesion.
also, can you upload some other prints that worked fine?
“Another idea is the layer height. When I use a 0.2mm nozzle, I set the layer height at 0.1mm, half the standard height of 0.2mm for a 0.4mm nozzle.”
I only use the standard plate that comes with the printer, the textured plate, so I have no experience there. if this is the top it’s possible that would help, if its the top ironing may help fill in the gaps, I would say that you need too change the first layer surface pattern, and that could help with the gaps. you could flip it and that would let you try ironing. i’m a newbie and also only 11, so I would suggest mentioning Panamon_Creel, as he has helped me and is awesome.
Your extrusion is terrible. Your calibration or profile looks off. You may have to do the manual calibration and save the number yourself. Also, consider turning on retraction if the flow is not the issue. Maybe it is extruding in a way that the over extrusion is more of a tool path issue.
Incidentally, what is the Flow Ratio that the calibration came up with? IMO, it should probably be lower than 0.98 (which is the base 0.40mm Nozzle Default).
Also, I would stay away from Arachne walls unless totally needed. That setting tends to generate lots of odd issues. To compensate, or improve the extrusion while not using Arachne, try Ironing on the “Solid Layers”. When I sliced your file using that the extrusion looked much better.
Here it is with the changes I would make, but I think the issue that needs adjusting the most is the flow ratio.
It doesn’t look terrible even at 0, but 5 and 10 appear a bit smoother (which means I need to increase the flow ratio). BTW, this calibration hides first-layer issues because the second and subsequent layers cover them up. I don’t understand why this isn’t just a single-layer test.
Bambu sent me a test file to check problem and…it was a great improvement. The main change in their file was initial layer and initial layer infill speed. Instead of 40mm/s and 70mm/s they used 15mm/s and 40mm/s (why is this not default and/or in the Bambu’s Wiki?):
