Squashed/Streched Hole/Circle in X & Y Axis
So investigating why does my machine when printing Holes / Circle in X & Y axis always streched. So i printed 20mm XYZ Calibration Cube
MK3S+ , PrusaSlicer 0.3mm , Generic PLA
belt tension X 254 Y 257 all nicely tight
if the hole facing Up (Z Axis) it was perfectly rounded
but if on X / Y axis it always streched, kindly any help?
Best Answer by FoxRun3D:
That's how things work. The last layers at the upper end of the holes have an inward curvature, to the point that the topmost ones print on thin air, so they sag. Horizontal holes should be perfect (as perfect as printer properties and tesselation allow) but vertical holes usually sag. You can try to compensate for it by designing tear shaped holes or drill holes out later.
The ribs you circled are probably a manifestation of the bulge effect--google for "prusa bulge" and you'll find 20+ pages of discussion--but no universal solution. You may want to try to adjust your extrusion multiplier.
RE: Squashed/Streched Hole/Circle in X & Y Axis
That's how things work. The last layers at the upper end of the holes have an inward curvature, to the point that the topmost ones print on thin air, so they sag. Horizontal holes should be perfect (as perfect as printer properties and tesselation allow) but vertical holes usually sag. You can try to compensate for it by designing tear shaped holes or drill holes out later.
The ribs you circled are probably a manifestation of the bulge effect--google for "prusa bulge" and you'll find 20+ pages of discussion--but no universal solution. You may want to try to adjust your extrusion multiplier.
Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...
RE: Squashed/Streched Hole/Circle in X & Y Axis
Thank you very much! You are very helpful!
That's how things work. The last layers at the upper end of the holes have an inward curvature, to the point that the topmost ones print on thin air, so they sag. Horizontal holes should be perfect (as perfect as printer properties and tesselation allow) but vertical holes usually sag. You can try to compensate for it by designing tear shaped holes or drill holes out later.
The ribs you circled are probably a manifestation of the bulge effect--google for "prusa bulge" and you'll find 20+ pages of discussion--but no universal solution. You may want to try to adjust your extrusion multiplier.