I wanted a simple base to enable me to easily swap the router to various jigs.  None I could find were a fit for the Ryobi 18V Palm router that has an odd body size of 61.5mm so designed my own.

Designed to print without supports. I printed in PETG with 4 walls and seems strong and doesn't flex that I can perceive.   

Requires a 50mm m6 bolt and nut