use $fn = $preview? 32 : 72; stepper_103H5205(); translate([0,0,50]) rotate([180,0,0]) stepper_103H5205(); union(){ translate([0,0,4]) rotate([180,0,0]) stepper_103H5205_bracket(); translate([0,0,46]) stepper_103H5205_bracket(); } translate([0,0,25]) difference(){ cylinder(h=30,d=12,center=true); cylinder(h=32,d=5,center=true); rotate([90,0,0]) { translate([0,8,0]) cylinder(h=32,d=3); translate([0,-8,0]) cylinder(h=32,d=3); } }