Although the stepper claimed to have a 1:64 reduction gear, the actual ratio wasn’t that precise ( [Rjeuch] estimates it as 1:63.876. The steps he took to fix this are worth a read.

For his entry into the 2019 Hackaday Prize, [Tobius Daichi] is working on adding some motion control capabilities to everyone’s favorite Linux SBC. His 3+Pi board attaches to the Raspberry Pi… ...