Parameterized Astronomy Camera Spacer

My telescope reducer and flattener needed very odd and precise spacing to achieve optimal performance so I created a SCAD file that creates a custom M42_.75 spacer based on your back focus needs. No more grabbing the wrong combination of spacers in the dark field and ruining your image set. My Prusa MK3 had no problem printing sub millimeter threads using the Threads.Scad file at http://dkprojects.net/openscad-threads/ . You can modify this file to print most astro adapter needs. I think my parts printed in PolyMaker PC Max are plenty strong but proceed at your own risk. A touch of Polylube grease on the threads helps and be very careful to start the threads properly. These examples will provide proper distance for ZWO ASI 1600mm camera with FilterWheel to Explore Scientific .7 reducer and Explore Scientific stock field flattener. You can input your accessories and go wild.