Hardware

Parts.
Battery Holders (to strip for parts):

InfraRed Module (for testing using Mega, IRRemote.h library has not been not updated yet for Nano):

Hip Bearings x 4

PCA 9685

Power Regulator

Nano 33IOT – includes on-board BT, Wi-Fi and accelerometers/gyroscopes. Still to be incorporated.

Servos

Battery contacts; use cut-down brass spacers that come with servos.

Bolts, bearings and any other hardware not mentioned here are from the original SpotMicro design. You don’t need all those parts so do an inventory of what you need first:

https://www.thingiverse.com/thing:3445283