3 circle_inner_rad = 10 + 0.5;
10 screw_hole_dia = 4.5 + 0.5;
14 circle_outer_rad = circle_inner_rad + thick;
18 circle(r=circle_outer_rad, $fn=150);
19 circle(r=circle_inner_rad, $fn=150);
20 mirror([1,0]) square([50,50]);
22 translate([-circle_outer_rad, -0.1])
23 multmatrix([[1,0,0,0],
27 square([thick, tab_sz + circle_outer_rad + thick]);
32 linear_extrude(height=width) Plan();
34 translate([-50, circle_outer_rad + tab_sz - width/2, width/2])
36 cylinder(r= screw_hole_dia / 2, h=100, $fn=50);