ZP6-A2 Hybrid: The "No-Solder" Hand Grinder Motorizer

The Idea

Most motorization projects require electronics knowledge, soldering, and sourcing sketchy electronic components. Not this one.

By leveraging the motor block of the Femobook A2, you get a high-torque, low-RPM motor with built-in automatic choke detection and auto-off. It’s the perfect starting point to transform your high-end hand grinder into an electric beast.

No hardware modification. The whole thing can be disassembled in seconds, and you get your ZP6 and A2 back as new.

Note: Designed specifically for the 1zpresso ZP6, but easily adaptable to most grinders by modeling a new collar.

The Drive Shaft Challenge

The main hurdle was linking the motor's 5mm female hex to the ZP6’s 6.35mm (1/4") male hex. Standard bit adapters are often too long or wobbly. I’ve documented two reliable solutions:

1. The "Hybrid" way: A 1/4" female hex to 1/4" square adapter + a 3D-printed sheath + a custom-cut 5mm Allen key. (Please note that due to the small size of the piece, a 0.2mm nozzle is pretty much required )

2. The "Coupler" way: A 7mm shaft coupler used with a custom-cut 5mm Allen key.

Assembly

Bill of Materials (BOM)

Implementation & Tips

• Adaptability: If you have a different grinder, you only need to modify the Collar file to match your grinder's diameter.

• Alignment: Ensure your 5mm Allen key segment is cut perfectly straight to avoid wobbling at high torque.

• Dial Indicator: cut a piece of color filament and insert it into the motor base part.

• Printed in PLA, 0.20mm, 4 walls. Use precision hole compensation if you want the rods to slide easily. Otherwise, use a 6mm drill bit to widen the rod holes slightly.

• USE RDT : The model in its current state tends to produce quite a bit of static retention. I intend to remedy that with a knocker and bellows, but in the meantime, RDT goes a long way.

Roadmap (V1.0)

This is an evolving project. Future updates will include:

• [ ] Custom Bellows for low retention

• [ ] Mechanical Knocker

• [ ] Custom CNC drive-shaft adapter model

Thanks & Acknowledgements

Credit to @fused_visions for our back-and-forth about modding the A2 . Check out their store and Instagram, they do great stuff

Credit in advance to @thcecilia and @SpoonUnit for the upcoming knocker design