Gyroid Infill causing print failure
I have loaded the new PrusaSlicer and used it to print a part which has on many occasions previously printed successfully. However, with the new PrusaSlicer it fails. I have tracked the issue down to the Gyroid infill. When set back to Rectilinear the part prints correctly.
The failure occurs when starting to print the second final layer when the filiment has to traverse the infill. Buckling that occurs in the first layer causes the nozzle to collide when printing the second layer. The filiment backs up in the nozzle and the pinch rollers start to strip the filiment. Total failure ensues.
RE: Gyroid Infill causing print failure
The issue is gyroid (at low infill percentages) seems to always have longer and shorter stretches of unsupported material on the first top layer.
With rectilinear the top infill first layer is always at 90 degrees to the infill so bridge spans are consistent in length.
The latter leads to a better surface finish and prints faster, so I don't see any advantages to make me want to use gyroid other than looks.
But if you insist on using it for your prints,I'd suggest upping the infill percentage to reduce the length of unsupported bridge.
RE: Gyroid Infill causing print failure
@vintagepc
I agree totally with what you have said. I really should have expanded upon what I observed and made some suggestions when using the new PrusaSlicer for the first time.
I think I am correct in saying that the old slicer defaulted to using rectilinear the new defaults to gyroid. Now, whereas it is true that gyroid results in a much stronger component it can result in failed prints. The reason being the void that the filiment has to span under low infill percentages. I fell into this trap because I did not take the time to check the infill type. My only excuse is that Prusa decided to make gyroid the default. Going forward I think what I would like to see is a warning to be given when gyroid is selected with low infills. Prusa team a suggestion here for you:-)
Also I am hoping that my observation will help others from wasting filiment when selecting gyroid with low infill.
RE: Gyroid Infill causing print failure
Curl (the effect of filament warping in short lengths between infill supported runs) happens regardless of infill type. Gyroid just happens to have longer unsupported runs due to the pattern. But you can get curl with any infill when the infill spacing is high.
You can also get curl when printing overhangs, and these are generally more disastrous as they happen at height, near print completion. They often result in spaghetti monster effects.
ps: the old profiles defaulted to grid... and some speed profiles still do.
RE: Gyroid Infill causing print failure
@vintagepc
I agree totally with what you have said. I really should have expanded upon what I observed and made some suggestions when using the new PrusaSlicer for the first time.
I think I am correct in saying that the old slicer defaulted to using rectilinear the new defaults to gyroid. Now, whereas it is true that gyroid results in a much stronger component it can result in failed prints. The reason being the void that the filiment has to span under low infill percentages. I fell into this trap because I did not take the time to check the infill type. My only excuse is that Prusa decided to make gyroid the default. Going forward I think what I would like to see is a warning to be given when gyroid is selected with low infills. Prusa team a suggestion here for you:-)
Also I am hoping that my observation will help others from wasting filiment when selecting gyroid with low infill.
You should consider filing a feature request on their github. It's far more likely to get attention then here.
https://github.com/prusa3d/PrusaSlicer/issues