As a fun side-project during 2020 I built a 3-mobile holonomic robot using some aluminum extrusion, 3d printed pieces, and Arduinos for both the control board and a remote control transmitter. I’ve featured it in the video embedded below:
Additionally, I’ve included some files necessary to build your own on Thingiverse:
https://www.thingiverse.com/thing:4147725
Lombardi Engineering 