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[Resuelto] Squashed/Streched Hole/Circle in X & Y Axis  

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kaisarantonn
(@kaisarantonn)
Active Member
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 fuchsr:

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. 

Respondido : 20/03/2022 5:58 am
fuchsr
(@fuchsr)
Famed Member
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. 

Respondido : 20/03/2022 12:34 pm
kaisarantonn me gusta
kaisarantonn
(@kaisarantonn)
Active Member
Topic starter answered:
RE: Squashed/Streched Hole/Circle in X & Y Axis

Thank you very much! You are very helpful!

Posted by: @fuchsr

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. 

 

Respondido : 20/03/2022 8:24 pm
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