MY Thingiverse : rod holder thing : 1462393
$fn=50; lenght = 10; lenght2 = 5; height1 = 2; height2 = 5; width = 4; space = 0.2; hole_radius = 0.9; rod_radius =1; module hole(pos){ translate([0,0,-0.01]){ linear_extrude(height = height2){ translate([pos,width/2,0]){ circle(r = hole_radius+0.01); } } } } difference(){ union(){ cube([lenght,width,height1]); translate([(lenght-lenght2)/2,0,0]){ cube([lenght2,width,height2]); } } union(){ union(){ hole((lenght-lenght2)/4); hole(lenght-(lenght-lenght2)/4); } translate([lenght/2,-0.01,height2-(height2-height1)/2]){ rotate([-90,0,0]){ linear_extrude(height=width+0.02){ union(){ circle(r=rod_radius); translate([-space/2,-height2,0]){ square([space,height2]); } } } } } } }