- translate([-arm_innerwidth/2, 1, 0])
- mirror([0,-1,0])
- cube([arm_innerwidth, arm_depth+1, arm_innerheight]);
+ difference(){
+ translate([-arm_innerwidth/2, 1, 0])
+ mirror([0,-1,0])
+ cube([arm_innerwidth, arm_depth+1, arm_innerheight]);
+ translate([0, -arm_pin_depth, -50])
+ cylinder(r=arm_pin_dia/2, h=100);
+ }