On this page you can download the STL files for the 3D printed 6" Newtonian telescope to be featured in my upcoming book Practical Projects for Astronomers.
Lower tube end and mirror base
Spring bush (print six, two per mirror support spring)
Upper tube end and secondary support
Tube ring (print two and line with thin felt)
Focuser mounting plate (will not suit all focusers, see book for alternatives)
Mounting shoe for Skywatcher/Celestron Finderscopes