common/2020_tslot.scad

/** 
 * @file
 * Generic library for fractional T-Slot extrusions.
 *
 * Creative Commons Share Alike 3.0
 * Copyright (c) 2014 Manuel García
 *
 * Original library (David Lee Miller)
 * https://www.thingiverse.com/thing:136430
 * 
 * Modified to be used in customizer
 */ 
include <./common.scad>;
//CUSTOMIZER VARIABLES

ProfileCore = 4.3 * 1;     // Profile core Ø (Default M5).
minkR_TS = 0.04 * 20;  // Minkowski radius for the T-Slot.
minkR_IC = 0.075 * 20; // Minkowski radius for the inner cutout.
minkR_PF = 0.05 * 20;  // Minkowski radius for the profile corners.

//CUSTOMIZER VARIABLES END

module 2020_tslot(height, core = ProfileCore) {
  linear_extrude(height = height, center = true)
  union() {
    difference() {
      minkowski() {
        translate([0, 0, 0]) circle(r = minkR_PF, $fn = 32);
        square([1 * 20 - 2 * minkR_PF, 1 * 20 - 2 * minkR_PF], center = true);
      }
      translate([0, 0, 0]) circle(r = core / 2, $fn = 24);
      translate([-0.5 * 20 + 0.087 * 20, 0, 0]) 2020_tslot_void();
      rotate([0, 0, 180]) translate([-0.5 * 20 + 0.087 * 20, 0, 0]) 2020_tslot_void();
      translate([0, -0.5 * 20 + 0.087 * 20, 0]) rotate([0, 0, 90]) 2020_tslot_void();
      translate([0, 0.5 * 20 - 0.087 * 20, 0]) rotate([0, 0, -90]) 2020_tslot_void();
    }
  }
}

module fillet(rad) {
  translate([-rad, -rad, 0])
  difference() {
    translate([0, 0, 0]) square([rad + 0.01, rad + 0.01]);
    circle(r = rad, $fn = 32);
  }
}

module inside_cutout() {
  minkowski() {
    translate([0, 0, 0]) circle(r = minkR_IC, center = true, $fn = 32);
    hull() {
      square([0.2 * 20 - minkR_IC, 0.645 * 20 - 2 * minkR_IC], center = true);
      square([0.8 * 20 - 2 * minkR_IC, 0.001 * 20], center = true);
    }
  }
}

module double_cutout() {
  union() {
    minkowski() {
      translate([0, 0, 0]) circle(r = minkR_IC, center = true, $fn = 32);
      union() {
        rotate([0, 0, 0]) hull() {
          translate([-0.5 * 20, 0, 0]) hull() {
            square([0.2 * 20 - minkR_IC, 0.645 * 20 - 2 * minkR_IC], center = true);
            square([0.8 * 20 - 2 * minkR_IC, 0.001 * 20], center = true);
          }
          translate([0.5 * 20, 0, 0]) hull() {
            square([0.2 * 20 - minkR_IC, 0.645 * 20 - 2 * minkR_IC], center = true);
            square([0.8 * 20 - 2 * minkR_IC, 0.001 * 20], center = true);
          }
        }
        rotate([0, 0, 90]) hull() {
          translate([-0.5 * 20, 0, 0]) hull() {
            square([0.2 * 20 - minkR_IC, 0.645 * 20 - 2 * minkR_IC], center = true);
            square([0.8 * 20 - 2 * minkR_IC, 0.001 * 20], center = true);
          }
          translate([0.5 * 20, 0, 0]) hull() {
            square([0.2 * 20 - minkR_IC, 0.645 * 20 - 2 * minkR_IC], center = true);
            square([0.8 * 20 - 2 * minkR_IC, 0.001 * 20], center = true);
          }
        }
      }
    }
    rotate([0, 0, 0]) translate([-0.645 * 20 / 2, -0.645 * 20 / 2, 0]) fillet(minkR_IC);
    rotate([0, 0, 180]) translate([-0.645 * 20 / 2, -0.645 * 20 / 2, 0]) fillet(minkR_IC);
    rotate([0, 0, 90]) translate([-0.645 * 20 / 2, -0.645 * 20 / 2, 0]) fillet(minkR_IC);
    rotate([0, 0, -90]) translate([-0.645 * 20 / 2, -0.645 * 20 / 2, 0]) fillet(minkR_IC);
  }
}

module 2020_tslot_void() {
  union() {
    translate([minkR_TS, 0, 0])
    minkowski() {
      translate([0, 0, 0]) circle(r = minkR_TS, $fn = 32);
      hull() {
        square([0.001 * 20, 0.585 * 20 - 2 * minkR_TS], center = true);
        translate([(0.233 * 20 - 2 * minkR_TS) / 2, 0, 0]) square([0.233 * 20 - 2 * minkR_TS, 0.2 * 20], center = true);
      }
    }
    translate([-0.255 * 20 / 2 + 0.01, 0, 0]) square(0.255 * 20, center = true);
    translate([-0.35 * 20 / 2 - 0.087 * 20 + 0.01, 0, 0]) square(0.35 * 20, center = true);
    translate([0, -0.255 * 20 / 2, 0]) fillet(minkR_TS / 2);
    translate([-0.087 * 20, -0.255 * 20 / 2, 0]) rotate([0, 0, 90]) fillet(minkR_TS / 2);
    scale([1, -1, 1]) translate([0, -0.255 * 20 / 2, 0]) fillet(minkR_TS / 2);
    scale([1, -1, 1]) translate([-0.087 * 20, -0.255 * 20 / 2, 0]) rotate([0, 0, 90]) fillet(minkR_TS / 2);
  }
}

module 2020_tslot_insert (pos = [0, 0, 0], rot = [0, 0, 0]) {
    H = 6;
    TopGapY = 7.3;
    TopGapZ = 4.3;
    BottomBevelY = 5;
    BottomBevelZ = -4;
    BevelAngle = 45;
    translate(pos) rotate(rot) difference() {
        cube([10, 10, H], center = true);
        //
        translate([0, TopGapY, TopGapZ]) cube([11, 10, H], center = true);
        translate([0, -TopGapY, TopGapZ]) cube([11, 10, H], center = true);
        //
        translate([0, -BottomBevelY, BottomBevelZ]) rotate([-BevelAngle, 0, 0]) cube([11, 10, H], center = true);
        translate([0, BottomBevelY, BottomBevelZ]) rotate([BevelAngle, 0, 0]) cube([11, 10, H], center = true);
        //nut
        translate([0, 0, -(H/2) + (3/2) - 0.01]) m3_nut(3);
        //bolt
        cylinder(r = R(3.25), h = H + 1, center = true, $fn = 30);
    }
}