The Youmagine 3D preview is borked, and I don't know how to edit it. Sorry about that.I print these at 0.1 mm layer height, and tape them to my Colorfabb boxes, so I can see what the filament looks like in real life, after it's been through the nozzle. The button shows how a rounded top will print, and the flat cutout parts include a horizontal top layer, a 90 degree vertical side, and a 14 degree diagonal section.