Rat Rig V-Core 4.1 Upgrade 

**Preorder item expected to ship by End of February Early March**

Bring the V-Core 4 experience to its next level
The V-Core 4.1 Upgrade Kit delivers the most meaningful refinements of the platform to existing V-Core 4.0 machines, focusing on stability, integration, and day-to-day usability.

All-new full-metal toolhead architecture
A purpose-built, rigid toolhead with significantly improved part cooling, integrated with the Orbitool O2S toolboard. The result is a clean, single-cable toolhead connection with fewer cables, fewer connections, faster assembly, and simpler long-term maintenance.

Steel X-axis gantry
Eliminates bi-metal thermal distortion in the X-axis assembly, improving thermal stability and delivering more consistent, repeatable first layers, especially in enclosed setups.

To fully unlock these hardware improvements, the upgrade is designed to be paired with RatOS 2.1 — introducing smarter calibration behaviour through an improved compensation mesh, enhanced multi-point true zero measurement, and adaptive heat soak for greater consistency with less manual tuning.