rodR = 4; rodRatio = .9; screwR = 1.3; screwL = 12; extra = 3; translate([10,10,0])standoff(); translate([-10,10,0])standoff(); translate([10,-10,0])standoff(); translate([-10,-10,0])standoff(); module standoff(){ difference(){ union(){ cylinder(r=rodR*rodRatio, h= screwL+extra); } translate([0,0,extra])cylinder(r=screwR, h = screwL*2); } }