Bahtinov Mask for Sky-Watcher Starlux 190MN Maksutov-Newtonian Telescope

I needed a Bahtinov focusing mask for my Sky-Watcher 190MN Maksutov-Newtonian telescope.  This design slips over the central hub for centering and rests on the outer mounting ring so that the mask does not touch the optics.

Note that this fills the bed for a standard Ender 3, so place bed clips and such appropriately to avoid collisions with the nozzle during priming and printing, or find a different way to hold the bed (tape, magnet, etc.).

I've incluced STL, STEP, and Fusion 360 models for anyone that may wish to make modifications.