use module tab() { translate([0,0,-tab_thick/2]) difference() { cube(size=[tab_height, tab_width, tab_thick], center=false); translate([tab_height-tab_round, tab_width -tab_round, 0]) round_cut(tab_round, tab_thick); translate([tab_height-tab_round, tab_round, 0]) rotate([0,0,-90]) round_cut(tab_round, tab_thick); } }