Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4875734.

This is a dust cap for the The Third Planet Optics Red Dot Multi-Reticle Finder. I've had this awesome finder scope on my telescope for around 15 years and the dust cap got lost someplace.

This is a simple replacement, fits nicely snug when printed with TPU.

Printed with a .4 mm nozzle at .2mm layer height positioned in an upright 'cup' orientation and use a bit of heat to remove the stringing from the interior.