This Odometry Holder is very customizable. Download the zipped package, and you will get an OBJ, STL, and STEP file of the two parts, the Odometry Wheel Holder and the Odometry Hex Insert. You will also get a folder of photos showing how the holder is assembled. Also included is a picture of Cura print settings when slicing the Odometry Wheel Holder.
This holder uses this encoder and this omni wheel along with this shaft and two of these ball bearings. The rest is able to be customized by you!