Stemer114

module slot_hole(
        width = 5,  //width/dia at ends
        length = 20,  //length
        thickness = 5  //thickness
        )
{
    hull() {
    translate([-length/2+width/2, 0, 0]) polyhole(h=thickness, d=width);
    translate([length/2-width/2, 0, 0]) polyhole(h=thickness, d=width);
    }

Stemer114

//nut trap
//default values are for M3 nut
//if you use this module as a nut trap cutout, you need to add +de (ie 0.1mm or similiar) to height
//in order to get non-manifold cutouts
module nut_trap (
        w = 5.5,
        h = 3
        )
{
        cylinder(r = w / 2 / cos(180 / 6) + 0.05, h=h, $fn=6);

Stemer114

/* beam with triangular support underneath,
 * length direction is x
 * beam dimensions are w, h1
 * support (triangle) height is h2
 * the beam is centered around the center of the rectangle
 */
module tribeam_x(
        w = 10,   //width
        h1 = 10,  //height of rectangular sub-beam
        h2 = 5,    //height of triangular sub-beam

Stemer114

// beam with length in x direction
// it is centered along its central axis at the x axis
module beam_x(
        wy = 10,  //width
        wz = 10,  //height
        l = 100  //length
        )
{
    translate([0, -wy/2, -wz/2])
    cube([l, wy, wz]);

Stemer114

// ring with cutout
// default values are for 1mm height, 10mm outside diameter and 5mm cutout
// de is epsilon environment to make cutouts non-manifold
module ring(
        h=1,
        od = 10,
        id = 5,
        de = 0.1
        ) 
{

Stemer114

// model countersunk screw for 3d printing
// useful for creating attachement bores
// which fit these screws
// default values are for 3mm x 20mm screw with 6mm head (3.2mm bore for tolerance)
module screw_countersunk(
        l=20,   //length
        dh = 6,   //head dia
        lh = 3,   //head length
        ds = 3.2,  //shaft dia
        )