OPENSCAD. Int dia 42.7,ext dia +5mm $fn=50; dd=42.7; de=dd+5; dp=14; btm=2; translate([-(dp+btm)/2,dd/2,(dp+btm)/2]){ rotate([0,90,0]){ difference(){ union(){ union(){ translate([-(dp+btm)/2,0.2,0]){cube([dp+btm,4,dp+btm]);} rotate([0,0,45]){cube([6,6,dp+btm]);} } difference(){ translate([0,1.6,0]){rotate([0,0,45]){cube([6,6,dp+btm]);}} translate([-6,1.8,-0.1]){cube([12,4,dp+btm+1]);} translate([-6,9,-0.1]){cube([12,4,dp+btm+1]);} } translate([-3,3,0]){cube([6,6,dp+btm]);} } translate([-1.5,4,-0.1]){cube([3,9,dp+btm+1]);} } } } difference(){ cylinder(h=btm+dp,d=de); translate([0,0,btm]){cylinder(h=dp+1,d=dd);} translate([+15,-5,-0.1]){cylinder(h=btm+dp,r=2);} translate([+7,+3,-0.1]){cylinder(h=btm+dp,r=5);}}