This is a 3D printable and easy-to-ensemble odometry module designed to fit in a GoBilda 1120 Series U-Channel.

To ensemble one module, you will need the 3 3D printed parts (x1 Base_TrackWheels_B_2021, x1 Base_TrackWheels_NB_2021, x1 Hub_TrackWheel) and:
x1 Rev 60 mm Omni wheel 
x1 Rev Through Bore Encoder
x1 8 mm * 12 mm X 3.5 mm Flanged Bearing
x 1 5 mm Hex to 8 mm Round Bearing Insert
x2 M3 * 35 mm Hex Cap Screw 
x1 M4 * 55 mm Button Head Screws
I also recommend using some rubber bands to ensure that the module always touches the floor.

I also recommend using some rubber bands to ensure that the module always touches the floor.

This is a good playlist for implementing odometry in an FTC robot using a GoBilda Mecanum Drivetrain. A lot of these concepts can be applied to this model.