Printrbot Jr M8 Z-axis upgrade

thingiverse

Upgrading to an M8 anti-backlash setup with two nuts and a spring necessitates using a hexagonal tube that captures both nuts. While Brian Evans' M6 model provides inspiration, an M8 rod requires larger alterations. The "missing sides" of the tube avoid interfering with the y-axis motor. The fit is snug, preventing issues with torsion. Brass, known for its self-lubricating properties in brass-on-brass mechanisms, is the material of choice for threaded rods and nuts. This cost-effective upgrade costs around £8 in the UK, but a more appropriate combo involving brass washers exists.