- External reference: https://www.reddit.com/r/openscad/comments/o2rooc/i_needed_a_headphone_hanger_for_a_25mm_thick/ tag: learning 3D printing
$fn=180;
linear_extrude(10)
offset(r=2)
difference(){
translate([-10,0])scale([2.5,1])circle(20);
translate([-10,-14])scale([2,1])square(29);
translate([-35,10])scale([2,1.5])circle(10);
}

My support is bigger (32mm), so I needed to change it a little bit
$fn=180;
linear_extrude(10)
offset(r=2)
difference(){
translate([-10,0])scale([2.5,1])circle(25);
translate([-10,-14])scale([2,1])square(34);
translate([-45,10])scale([2,1.5])circle(10);
}

Notes linking here
- 3D print maybe list (braindump)