As you say, you are new to Cura. You need to tune the printer to match the filament, and get the correct settings into cura. It is not as easy as the adverts say. First, level bed, then get the z offset set. Install the cura extensions for test prints, run the temperature tower, and others. Make sure your extruder steps are correct. Nothing wrong with the scad file. The rest of it is up to the printer settings. If it was easy, everybody would be doing it. Best wishes, Ray On 14/04/2021 10:37, Terrypin via Discuss wrote: > > module polyhole(h, d) { >     n = max(round(2 * d),3); >     rotate([0,0,180]) >         cylinder(h = h, r = (d / 2) / cos (180 / n), $fn = n); > } > > > difference() { >         translate ([5,4,0]) cube(size = [25,20,3]); >     union() { >     for(i = [2:4]) { >             translate([(i * i + i)/2 + 3 * i , 10,-1]) >                 polyhole(h = 5, d = i); > >             assign(d = i + 0.5) >                 translate([(d * d + d)/2 + 3 * d, 17,-1]) >                     polyhole(h = 5, d = d); >     } >     } > }