This is a Bahtinov mask designed for the Astro-Tech 6" f/9 Ritchey-Chrétien astrograph. The dimensions are based off of the original dust cap, and the slit design was generated from this site: http://astrojargon.net/MaskGen.aspx
We're sure Ramblin_Ray would love to see what you've printed.
Please document your print and share a Make with the community.
To post a Make simply visit this Thing again and click
Post a Make to start uploading your photo. It’s even easier
to post a Make via the Thingiverse Mobile app (available via
and Apple App Store).