// empty cube to test ninjaflex inner/outer wall adhesion nozzle_diameter = 0.5; d = 20; h = 10; wall = nozzle_diameter*2; base = 1; difference () { cube ([d, d, h], center=true); translate ([0, 0, base]) #cube ([d-wall*2, d-wall*2, h+0.01], center=true); }