nut traps metric (predefined, no params necessary)

nut_trap_metric.scad

//metric nut traps (M3 .. M4)
//see https://gist.github.com/Stemer114

// you can use the param functions for e.g. translation ops
// (access to height, thickness etc.)
function nut_trap_eps() = 0.1;        //epsilon environment for non-manifold differences
function nut_trap_m3_w()      = 5.5;  //M3 wrench size
function nut_trap_m3_h()      = 3;    //M3 nut thickness
function nut_trap_m3nyloc_h() = 4.1;  //M3 nyloc nut thickness
function nut_trap_m4_w()      = 7;    //M4 .. (and so on)
function nut_trap_m4_h()      = 3.1;
function nut_trap_m4nyloc_h() = 4.8;

//metric nut traps (ready to use in code without further params)
module nut_trap_m3()      { nut_trap( w=nut_trap_m3_w(), h=nut_trap_m3_h()      + nut_trap_eps() ); }
module nut_trap_m3nyloc() { nut_trap( w=nut_trap_m3_w(), h=nut_trap_m3nyloc_h() + nut_trap_eps() ); }
module nut_trap_m4()      { nut_trap( w=nut_trap_m4_w(), h=nut_trap_m4_h()      + nut_trap_eps() ); }
module nut_trap_m4nyloc() { nut_trap( w=nut_trap_m4_w(), h=nut_trap_m4nyloc_h() + nut_trap_eps() ); }

//generic nut trap (used by above)
module nut_trap() { cylinder(r = w / 2 / cos(180 / 6) + 0.05, h=h, $fn=6); }