Pico DS3218 belt drive
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Modified parts to use the stronger ds3218 servo on a belt drive pico.
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Only parts that are changed are the sliding servo arm and the pulley base. All parts should be interchangeable with the 4 lane pico but I've only tested it on the 3 lane.
I've also included printed spacers to use the extra bom bearings as idlers instead of the stock ptfe tube. Belt length should be 20cm and can be cut down to provide enough tension (same as stock pico).
Belt is mounted with the servo position at 0deg with the cam shaft in the lane 0 position. Homing position should be set to 180deg (max servo angle needs to be set to 180 in cfg). Stepper motor needs to be rotated so the wires exit the bottom as the servo sits too close.
This servo draws too many amps from the manta boards 5v 5a step down converter. I'd recommend running an independent buck converter if you power the pi from your mainboard.