pumpjack oil 3d models

...oil-based walnut stain)Raspberry Pi 3B+ and MicroSD card 4GB or larger (note, the Pi 4 isn't yet supported with this model, because the ports are arranged differently)Geekworm X400 v3.0 DAC/amplifier (Aliexpress)A power supply to suit the X400, e.g.

2) Clean and lubricate (lithium grease or 3in1 oil) your linear guides, if notchy then check the bearings are all present, there should be a gap of 1 bearing width in the row of balls. Be careful not to allow the carriages to slide off the rails...