Z-Upgrade 4.0 for VCore 4.0/4.1 Ballscrews mod

The Z-Upgrade replace the original Z system with a ballscrews driven system. The best system for layer staking!
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updated May 10, 2026

Description

PDF

STORE LINK

AVAILABLE with 1204 and 1605 Ballscrew

A Z-Upgrade complete overhaul for VCORE 4.0/4.1

The Z-Upgrade replace the original Z system with a ballscrews driven system.

More precise, more reliable over time, it offers a very high repeatability and a perfect consistancy in layer staking compared to a trapezoidal screw.

Maintenance-free and made to last in a production line. No wobble over Z.

Proofed design since 2021. More than 450+ happy users

Lifetime support and warranty over the parts

Integrated design pushed further to maximize fonctions and size to keep the whole print Z volume

Following the feedbacks, tests, assemblies, this version is born to simplify, and solve all the little things from the 3.x versions.

Parts count reduced, hardware quantity reduced, steps of assembly reduced, price reduced!

The Spring Guard from the previous revision, but better!

Springs guard will secure the balls, and will delete the possible eventuallity of them escaping the mechanism.

This can happen when lifting the bed or the PEI, or over a short over-acceleration on a Z motion by exemple.

This modification will allow a better Z accelerations (Tilt+Mesh faster)

Avoid time lost in looking for the balls which fell of.

This solution won't mess with the anti-wobble capability.

This last version allow an easier assembly, and a simplified bed arm design

New mod, new applications:

Z-Upgrade has been designed to fit all the needs: From standard stock 300mm machine to extreme 1000mm build with resilient conception in mind, the Z-Upgrade 4.0 fits for every need.

Details:

The base kit is  common to any Vcore size, only the ballscrews needs to be longer or shorter to anapt, 300, 400, 500 or any other dimension

To choose the Ballscrews: Machine size + 150mm

EXEMPLE: I got a Vcore 400, I choose 550mm (400+150) Ballcrew lenght

Manual Available here or at the bottom of the files section page

BOM Available here

Kits printed in high quality annealed PA12-CF or PPS-CF with advanced in house process.

Release date

Patch done

01/02/2026

Official release

02/02/2026

Small aestetic fix on the rear arm

04/02/2026

top retainers a bit redesigned to avoid ooze guard possible collision

05/02/2026

BOM + User Manual release

10/03/2026

Wider screw opening, 4mm hole insert corrected

15/03/2026

1204 model release 

17/03/2026

MANUAL + BOM Update for 1204

25/03/2026

Small changes to print it easier (Bottom cage and tensionner)

27/03/2026

Small changes to print it easier: Mainblocks and FK10 units (for 1204), Some clearance margins inside the bottom cage

01/04/2026

Small changes in anchoring points for the Mainblock R+L (-2mm of seat), BOM revision with the add of a M4x40mm screws for the rear block instead of the M4x20mm. For previous printed parts, use a 2mm washers or printed standoff

10/04/2026

FK12 custom (SFU1605) model added for 6001 Bearings (28mm) as secondary option of a metal FK12

24/04/2026

On the FK12 and FK10, no locknut need to be installed since it can induce Z artifacts in some cases. Manual + BOM updated

10/05/2026

Rear arm champfer correction (previous interference with VAOC module)

STORE LINK

Compatibility:

ONLY for VCORE 4.0/4.1 CORE XY and HYBRID CORE XY

The Z-Upgrade fit exactly like the stock Z-System volume, it is then fully compatible with IDEX and VAOC. Only the 3mm holes on the bottom plates needs to be enlarged to 4mm

License:

Under license CC-SA-BY-NC 4.0

Customs: 

Important Note foor US customers:

This Bundle has some advantages for North America customers: Tariff will only apply to printed parts, the ballscrews are shipped from a US supplier, this will reduce the shipping and the import taxes.

Z-Upgrade parts are the same across 300/400/500, only the ballscrew lengh changes.

Credits: 

-@Ratrig for the VCORE-4.0/4.1 amazing design-@MirageC EVOMOTO Oldham/Wobblex magical design

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The author marked this model as their own original creation.

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