Prevent bulging corners?
I need my print to have as square a corner as possible. Is there a print setting to adjust this? The attached picture shows how the outside corners are slightly bulged, resulting in a bad fit with the other part it mates with.
RE: Prevent bulging corners?
Assuming what we're looking at is the bottom of the model, this first layer looks very bad. Not just the bulge. I'd start with the two basics: clean your sheet with hot water and dish washing soap, and do a proper first layer calibration. Then post a photo of the first layer using something like https://www.printables.com/model/105404 or a large square.
It'll also help to upload a 3mf file with your model. Save the project from Prusaslicer's File menu. Then zip compress it and use the Attach file button to upload it here. It's necessary to compress it because for reasons no one at Prusa has ever cared to explain, we cannot upload 3mf files directly. That's the best way to get quality suggestions, because the 3mf contains all your settings, in addition to the model, so we can do better than just offer wild guesses.
Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...
RE:
Actually that is the top of the print. 3mf is attached.
RE: Prevent bulging corners?
I can't see any printer or print settings in the 3mf file. Did you save it from Prusaslicer?
Also, the orientation of the STL in the 3mf is such that what you said was the top is sitting on the print bed. So I'm confused?!
Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...
RE: Prevent bulging corners?
Sorry about that. I think the first attachment was the export from Fusion 360. Here's the file saved from PrusaSlicer
RE: Prevent bulging corners?
I can't see anything wrong with the settings. Any modifications on your Mini? That top layer looks bad, with the gaps between all the perimeter lines. I would print a hollow calibration cube to make sure my extrusion multiplier is set correctly for the material I'm using. See https://help.prusa3d.com/article/extrusion-multiplier-calibration_2257. Also check for other signs of underextrusion and take corrective action, e.g., cold pulls.
Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...
RE: Prevent bulging corners?
@infinitemachinery
I see a couple things in your image that I can offer some suggestions on, first off it looks like your using the arachne perimeter generator. If that's the case I'd recommend using the Original perimeter generator for this print and manually adjusting your extrusion widths, I'm seeing what looks like separation in the perimeter walls. The other thing I think is that you have your seams on the outside corners. The features are kind of thin and in this case maybe moving them to a middle area of the wall will be best, this will help with the placement of and possible adjustment of retractions if needed as well.
RE: Prevent bulging corners?
I tried your suggested configuration changes, and it did improve the separation, but I'm still getting the bulge on the corners. I'm wondering this has something to do with how the print head needs to slow down to round the corner, yet the extrusion flow is remaining constant. Is there a parameter to adjust this?
RE: Prevent bulging corners?
Some ideas...
- You can change the acceleration (advanced) in Print Settings > Speed > Acceleration Control: Try with "Perimeters" on 400 mm/s2.
- Lower the nozzle temp
- Decrease Filament > Extrusion Multiplier (if you have gaps again, then you have under-extrusion)
RE:
I just printed your part and achieved the best result reducing the perimeter speed to 20 (Perimeters, Small Perimeters, External Perimeters). NOTE: This small bar is only 1.7mm. BTW: I printed this with PETG.
