Mercury 1.1 / Ender 5 Plus | Belted Z

Ender 5 Plus Belted Z Mod (Based on Ein’s SimpleCore Design)

This mod adapts Ein’s SimpleCore belted Z to the Ender 5 Plus. It has been very reliable—no issues printing ~2 kg parts.
Use high-quality 10 mm belts.
For additional background and motion-system details, reference Ein’s original mod.

Frame Changes

You must either remove or cut the stock 2020 extrusions that hold the Z-rod brackets.

If you remove them: use the included Z-Rod Stabilizer Spacers.

I used spacers on the bottom and cut the top extrusions.

Pulleys & Clearance

Using CNC 80T pulleys requires slightly filing the frame for clearance.

Modifying the motor mounts is possible, but reduces X build volume—especially with a UHF hotend.

Build volume notes:

Stock X: 377 mm → With Stealthburner + Rapido UHF: 371 mm usable

Original mod uses 20T motor pulleys; 16T (Voron 2.4 spec) yield more torque, highly recommend using 16T instead! Bed drops much slower with 16t if you decide not to run either option to prevent bed drop below. 

Bed Drop Prevention

The E5+ bed will fall when motors power off. Two options:

Recommended:

Electromagnetic brake NEMA17 motors (more expensive + extra wiring). 

https://www.omc-stepperonline.com/nema-17-stepper-motor-0-72nm-101-96oz-in-with-24v-3-7w-electromagnetic-brake-17hs24-2004d-b070

Alternative:

Use 4× door closers (pulley carrier parts included but cable path not optimized and does cause banding, although with a smoother cable path i think it could be resolved).

Parts Links

Door Closers:
https://www.amazon.com/dp/B0BR564SQG

Door Closer Mount:
https://www.printables.com/model/437120-enderwireswitchwire-mount-for-alternative-to-keyba

M3 Grooved Bearings:
https://www.amazon.com/dp/B082PQ6XNY