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Horizontal holes ar not ok to be rounded. Best to use this romboid cylinder to make a hole suited for 3d printing.

The model can be added to Prusa Slicer gallery and used as negative volume.

Adding to gallery:

After that, it can be added as a negative volume:

Then you cand resize it, but first disable scaling (click on the lock icon to unlock it):

result:

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Negative volume - double tear romboid cylinder for horizontal holes

Model files

doubleTearRomboidCylinder stl

doubleTearRomboidCylinder stl

capedDoubleTearRomboidCylinder stl

capedDoubleTearRomboidCylinder stl

tearCilinder fcstd

tearCilinder fcstd

Model origin

License

doubleTearRomboidCylinder
stl

doubleTearRomboidCylinder
stl

capedDoubleTearRomboidCylinder
stl

capedDoubleTearRomboidCylinder
stl

tearCilinder
fcstd

tearCilinder
fcstd