Big Z

thingiverse

This extended Z axis for a Makerbot Cupcake employs LM8UU linear bearings and 8mm rods, reaching roughly 200mm in height. The design focuses on a robust spine for support with minimal parts. Although it currently uses a threaded rod from the original Z-axis, plans are underway to replace this with an Acme rod soon. Despite efforts, even the least wobbly threaded rod causes noticeable vibration. To print this, you need a machine capable of 200mm height; smaller parts for Cupcake printing may be available if desired. Spine and Z-rider arm assembly require removal of the entire original Z-axis and top/back Cupcake body components. Testing can be done separately before mounting on the back. Stiffness is added through front supports. Two spine versions are provided: Spine 1, printed in PLA but overly robust, and Spine V2, a simplified design. ABS is better for Spine 1 due to its flexibility. The 8mm rods and LM8UU bearings are from VXB Bearings. Motor shaft coupling options are available for NEMA17 motors.