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#!/usr/bin/perl
use warnings;
use strict;
use Imager;

my $h = shift || 6;
my $w = shift || 25;

my @col =
  (

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#!/bin/sh

exec jq -r --raw-input --slurp \
   'def part1(r):
        range(r[0];r[1]+1) | tostring |
        select((. | length) == 6) |
        select(. | test("(.)\\1")) |
        split("") |
        select(.[0] <= .[1] and
               .[1] <= .[2] and

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30.60 KJN 40x40 extrusions 3 x 1m
      ITM02633
      http://www.aluminium-profile.co.uk/acatalog/8mm_Slot_ITM_Profile.html

31.00 200m filament from faberdashery

78.33 Grabercars bearings
      9 x Dual 623 Wide V Roller - fits both 3mm and 8mm T-Slot extrusions
          http://3d.grabercars.com/?product=dual-623-wide-v-roller-fits-both-3mm-and-8mm-t-slot-extrusions
      3 x Delrin V-Groove Idler Pulley – 8mm I.D.

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part = "model"; // 'left', 'right' or 'model'
angle = 25;
roundness = 2;
inset = 2;
depth = 90;
thickness = 20;
screw_diameter = 3*1.2;
screw_head_diameter = 5.5*1.2;
// screw_head_height = 3 * 1.2;
$fn = 30;

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include <config.scad>;
use <metric-cerberus.scad>;

hole = 45;
$fn=12;

difference() {
  union() {
    cube([hole+5,30,8], center = true);
    for (i=[-1,1]) {

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