Bug in PrusaSlicer? Open Layer at PrusaSlicer! 3D-model is ok and has close surface
Hi Community,
I need your help. During my last prints I had any time problems with the Covid-19 mask.
I used the standard STL-file from Thinigverse
https://www.thingiverse.com/thing:4256244
The print model had some holes or had breaks. Then I analysed the 3D-Model. This model was ok with no holes. a dealer look into Prusa-Slicer 2.2.2.0+ shows some layers which a anytime open.
See attached pictures. Model and Sliced part.
I also tried to repair this STL-File with the on-board "repair"-function of PrusaSlicer but the "repaired"-OBJ-File has the same failures like the original STL-Files.
Also any changes of a different layer showed the same problems.
Is this a bug in PrusaSlicer?
Some months ago I open up a bug, which was accepted by the PrusaSlicer developer. Is this now the same problem?
Please help, because I will print this covid-19 mask soon.
Any ideas what to do?
RE: Bug in PrusaSlicer? Open Layer at PrusaSlicer! 3D-model is ok and has close surface
Try saving your project as .... which saves a .3mf with all of the models and settings used, zip it up and attach it here. Without that theres very little we can do to debug your problem. For example when I download that thing its has multiple versions of parts and multiple parts. Which exact ones are you using ? Does the angle placed on the bed make a difference ? there are literally millions of variables all of which could potentially impact things, by posting your problem 3mf it means we are working from all the same settings.
RE: Bug in PrusaSlicer? Open Layer at PrusaSlicer! 3D-model is ok and has close surface
Here is the AMF-File.
First File is: Heavy_Duty_-_Mask_Large_repair ==> repaired with PrusaSlicer
Second File is: Regular_-_Filter_Cover_All_Sizes_repair ==> repaired with PrusaSlicer
Attached find the AMF-File with the settings.
RE: Bug in PrusaSlicer? Open Layer at PrusaSlicer! 3D-model is ok and has close surface
Just checked if the failure is the same, when I turn the 3D-model by 30 degrees.
Same problem at the same location.
RE: Bug in PrusaSlicer? Open Layer at PrusaSlicer! 3D-model is ok and has close surface
@joerg
It needs to be saved as a .3mf file not amf. I loaded that amf file into Prusa Slicer v2.2.0, when opened the printer type was listed as -default FFF-, the filament type was listed as Prusament PLA and the print settings as 0.15mm Speed. When asked for a specific format please supply that format.
However in this case now I know what model you are actually using I can tell you precisely why the are gaps. Yes the model is ok, its manifold and meets all the criteria to be 3d printed. However its design is NOT optimised for 3d printing. From a 3d printing standpoint its a terrible model. I'll attach a picture of the cross section of that part of the model. You will see it is so thin in the area that is missing that the perimeter falls below the extrusion width so slicer doesn't print it. That combined with the curved edge rising up (which is a bad idea on any 3d printed model as a fillet works better) is just asking for trouble.
You could try and mitigate this by turning on detect thin walls which is an advanced option under Print Settings> Layers And Perimeter but as I've already tried it I wouldn't bother, it just makes other parts of the model worse without actually filling the area in, its just too thin. The other usual option to try and print parts that are too thin is to reduce the extrusion width under Print Settings>advanced. Going below the nozzle size is not really practical and even putting first layer, and both perimeters down to 0.4 still doesnt work. That edge and especially the corners where a 90 degree box is approaching the curved outer just doesnt work.
Basically find a better model or alter the model to keep a constant shell thickness.
Cross section ;-
