Bahtinov Mask for Sky-Watcher 200mm aperture telescope (parametric)
thingiverse
I modified a model: https://www.thingiverse.com/thing:160391 to fit my Sky-Watcher 200mm perfectly. The mask itself measures about 190mm due to printer limitations, but it works flawlessly. A central peg is designed to slide into the screw gap at the back of the secondary, securely holding the mask in place. Three holes are also strategically placed for fitting thumbscrews onto the mirror. To maximize light intake, I deliberately made the slits quite large. Every aspect of this design can be easily modified within the scad file.
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