- translate([0, 0, holder_height / 2 + wall_thickness]){
- cube([holder_diameter + 0.1, gap, holder_height],
+ translate([0, 0, holder_floor + (holder_height - holder_floor) / 2 + 0.5]){
+ cube([holder_diameter + 0.1, gap, holder_height - holder_floor + 0.1],