Celestron C6-N Tri-Bahtinov Mask

Model is intended for Celestron C6-N telescope with 150mm aperture and 750mm focal length. You can use it for:

• Check of the telescope collimation and its adjustment.
• Check of the proper focus and its adjustment.

Also, you can use it for initial centering of the secondary mirror holder. Center hole diameter is 35mm, and fits exactly on the holder. Spider vanes then can be adjusted to center the whole assembly in the tube.

Model is smaller on purpose, and leaves some clearance to counter manufacturing tolerances of the telescope. If you need tight fit, just add some thin padding to outer edges. Center hole fits exactly.

Design is based on forum topic here: https://www.cloudynights.com/topic/536410-a-tri-bahtinov-mask-for-sct-collimation-and-focusing/

Print from PLA with 0.4mm nozzle, 0.2mm layer height and 15% infill.