- translate([-12, -10, idler_height / 2]) rotate([90, 0, 90]) oval(r=rod, l=12, h=25);
- //nut
- translate([0, -17, idler_height / 2]) rotate([90, 0, 0]) cylinder(r=m4_nut_diameter_horizontal / 2, h=9, $fn=6, center=true);
- translate([0, -19, idler_height / 2]) rotate([90, 90, 0]) cylinder(r=m4_diameter / 2, h=15, $fn=7, center=true);
+ translate([-12, -8, idler_height / 2]) rotate([90, 0, 90]) oval(r=rod + 0.01, l=12, h=25);
+ translate([0, -13 - single_wall_width*2, idler_height / 2]) {
+ // nut for tensioning screw
+ translate([0,0,0]) rotate([90, 0, 0]) cylinder(r=m4_nut_diameter_horizontal / 2, h=3.8, $fn=6);
+ // nut insert
+ translate([-2, -3.8, -m4_diameter * 1.5 / 2]) cube([20, 3.8, m4_diameter * 1.5+0.3]);
+ }