Minimal Spray Coolant upgrade for BZT CNC mill

(printed in PLA on Printrbot Simple Metal)

I had a hairy experience recently while milling acrylic panels for a heated build chamber (See also http://www.thingiverse.com/thing:915401 ). So I upgraded the cooling system and haven't had any issues since. These parts will fasten a coolant bottle and Noga minimal spray sytem on BZT cnc mills. M4 threads and M4 locknuts tighten the parts against a complementary fasteners. The bottle fixture won't collide when milling near the machine limits (this