Laser Adaptor for the Quick Release Bosch Colt CNC Spindle Mount
This part allows you to mount a JTech Photonics laser unit and adapts it to match the diameter of the Bosch Colt, allowing you to interchangeably mount the laser or Colt in the same mount. The adaptor also has a mount for a 40mm fan to cool the laser.
See http://www.thingiverse.com/thing:648883 for the quick release mount portion.