help needed: odd gaps in one corner of a printed box
Hi all. I need your experience to improve the print settings.
I print a small box of 40 x 50 x 15 mm on a Prusa MK3S, running the latest Prusa Slicer 2.8.1 and firmware. In each print I get odd gaps at only one corner of the box (see image). I use standard configuration for Prusament PETG and preset 0.3 mm draft.
Any ideas and suggestions much appreciated.
RE: help needed: odd gaps in one corner of a printed box
That's bizarre. I wouldn't think that it's a problem with your settings in the slicer seeing as the gaps are so large that your retraction settings would have to be wildly modified to create this issue. I would check that the set screws on your extruder gear are tightened fully and the spring tension on the idler door is set correctly. Also check for wear on the teeth of your extruder gears.
RE: help needed: odd gaps in one corner of a printed box
I would actually look at that the set screws on your extruder gear are fixed completely and the spring strain on the idler entryway is set accurately. Additionally check for wear on the teeth of your extruder gears.
RE: help needed: odd gaps in one corner of a printed box
Please save your project as a .3mf file
Files > Save Project as
Zip the .3mf and post it here. It will contain both your part and your settings for us to diagnose.
Cheerio,
RE: help needed: odd gaps in one corner of a printed box
Many thanks everyone for your ideas and help. The odd thing is that these gaps occur only at one of the four equal corners of the box.
I think I have found the issue meantime. Problem is mainly in the CAD model. The inner and outer radius at the corner is different. This causes the slicer to add a tiny additional perimeter in the corner. However, still unclear why the issue happens only in this specific corner.
I have improved the CAD file with equal inner and outer radius. The printed part is now good, no more gaps in the corner.
Attached the 3MF file with the initial CAD that had the issue in one corner. If you have any additional explanations I'd happy to try. Many thanks again.
OK, a little bit of coincidence here.
You have no convenient corners for the slicer to hide the seam so it's placed at the culmination of a cuve; normally this would just case a harmless blemish but it so happens that the extra internal extrusions that pad the corner run out at the same point causing a tension concentration in the same place. By removing the padding you removed the extra stress, alternatively you might have moved the seam by painting it elsewhere or by changing the positinal setting to random.
Cheerio,