First-time Voron builder adds StealthChanger tool changer for multicolor prints

A first-time Voron builder turned a 350 x 350 mm LDO Voron 2.4 into a StealthChanger-equipped tool changer, then aimed it at one of the hardest jobs in hobby printing: multicolor TPU. The machine, documented on July 9, used a Rapido2 hotend, an Orbiter-2.5 extruder, and an Ant-Head tool head, with the builder saying he was chasing HueForge-style multicolor motifs in flexible filament.

That choice matters because TPU exposes the weak point in a lot of standard multi-material setups. HueForge is built around filament painting and layer swaps to create detailed color prints, but Snapmaker has pointed out that soft TPU can jam during retraction in conventional systems. A tool changer side-steps that by giving each material its own head, so the filament does not have to fight its way through a shared hotend and back out again. In this build, the system uses a prime tower rather than a purge tower, which is the kind of detail that separates a working tool changer from a pretty concept.

StealthChanger is not a one-off hack. DraftShift Design’s open-source system is built for Voron printers and other front-mount motion systems, and its documentation says the shuttle and backplate can completely remove the toolhead from the gantry. The hardware also behaves like Voron Tap for probing, and the Shuttle and Backplate replace Voron TAP hardware except for the optoTAP sensor. LDO Motion now sells a dedicated Stealth Changer kit for Voron 2.4 machines, with support for both 300 mm and 350 mm builds, which helps explain how a once-obscure mod has become reachable for more builders.

The payoff is flexibility, but the overhead is real. The build described a 600-watt power supply for six tools, plus the mess of umbilicals and the grind of calibrating nozzle offsets across six nozzles. That is a very different proposition from dropping a multicolor add-on onto a single-head printer and calling it done. It also sits in a different class from the best-known commercial benchmark, the Original Prusa XL, which Prusa positions as a five-head tool changer with a 360 x 360 x 360 mm build volume and which Prusa said in February 2026 would get new toolheads in 2026.

That leaves the decision pretty clear. If the goal is clean multicolor work in TPU, a DIY tool changer like this Voron 2.4 can deliver capabilities that AMS-style systems still struggle to match. If the goal is the least friction, the least tuning, and the least calibration pain, the simpler multicolor route still wins.