StealthChanger: what it is, what it fits and what it costs

StealthChanger is a free, open-source toolchanger by DraftShift Design for the Voron 2.4 and other printers with a front-mounted MGN12 or MGN9 linear rail on the X axis. LDO’s kit for a 300 mm Voron 2.4 was listed at $246.70 for one tool on October 14, 2026, plus $59.90 per extra tool. Hotends and extruders are not included.

What is StealthChanger?

StealthChanger is an open-source toolchanger for Voron-style printers. A shuttle replaces the X carriage, and each toolhead gets a backplate that locks onto it with steel pins, brass bushings and N52 magnets. Idle tools rest in docks at the front of the frame. Each tool carries an OptoTap sensor, so the tool itself is the Z probe.

The design is published on GitHub at DraftShift/StealthChanger under the GPL-3.0 license. The current documentation lives at stealthchanger.com, and the older GitHub wiki is still online. The project started from Viesturz’s TapChanger, swapping its heat-set bearing mounts for bushings and pins. Its README says input shaper tests show it “as rigid if not more than” TapChanger.

A full build involves more than the shuttle and backplates:

• Docks. DraftShift’s Modular Dock hangs from the top front extrusion. The Door Buffer adds a crossbar under the docks for stiffness.
• Tophat. Enclosed printers need a taller top so the umbilical cables can arch over the bed. The FAQ suggests 200 mm extra height for a 250 mm build, 225 mm for 300 mm and 250 mm for 350 mm.
• One toolhead board per tool. The wiki calls CAN (Controller Area Network) bus “nearly a requirement” for manageable wiring. USB toolboards also work.
• Software. The docs configure Klipper with klipper-toolchanger-easy. See Klipper toolchanger configuration.
• Version. Shuttles and backplates are now V1.1, which is marked on each part. Don’t mix V1.1 with earlier parts, because the two are not compatible.

Assembly is covered in the StealthChanger build guide, and probing and Z offsets in StealthChanger probe.

Which printers can run StealthChanger?

The Voron 2.4 is the official target. The docs extend support to Voron-style printers whose gantry moves in Z and carries a front-mounted MGN12 or MGN9 X rail, and their tool-count table includes the 180 mm Voron Micron. The Sovol SV08 has only community usermods (user-contributed parts). The Trident and Rat Rig have no StealthChanger parts in the project.

Printer	Status	What exists, as of October 14, 2026
Voron 2.4 (250, 300, 350 mm)	Official	The design target. LDO’s kits are sized for the 300 and 350 mm versions. Usermods also cover the Vorlong, a 2.4 extended 100 mm in Y to move the docks off the bed.
Voron Micron (180 mm)	Official (in the docs)	Listed in the docs’ tool-count table, with an MGN9 shuttle. A 3 mm belt-helper usermod covers Micron and V0 belts.
Sovol SV08	Community usermods	TheSin-’s SV08 Top Dockbar Brackets reuse the top-bar bolts to add a 420 mm 2020 extrusion for the docks, and the LED bar has to move. seenit783’s SV08 Umbilical Back Plate has six cable ports.
Voron Trident	Not covered by the project	No Trident-specific parts, kits or usermods.
Rat Rig V-Core	Not covered by the project	No Rat Rig entry in DraftShift’s usermod index.

On a Trident or a Rat Rig, plan to adapt the docks yourself. A TeamFDM post by Demosth (August 2026) still argues that the Trident is the easier base for any toolchanger. Its gantry stays at the top of the frame, so docks bolted to the frame never move relative to the gantry. On a 2.4 the whole gantry travels up and down.

For other Voron toolchanger options, see Voron toolchanger options.

How many tools fit

Dock width limits the tool count. The docs list two widths: standard (60 mm, used by Anthead, DragonBurner, RapidBurner, Yavoth and the Mini StealthBurner) and wide (76 mm, used by A4T, BlackBird, JabberWocky, StealthBurner and XOL). The maximum tool counts, from the docs:

Printer size	Standard-width tools	Wide tools
Micron 180 mm	4	not listed
Voron 250 mm	4	3
Voron 300 mm	5	4
Voron 350 mm	6	5

For a frame the table doesn’t list, the wiki’s Docks page gives a rough method: take the length of the top front extrusion, subtract 40 mm (the gantry needs about 20 mm on each side to pass the docks) and divide what is left by the tool width, allowing about 5 mm between standard tools for extruder handles. DraftShift’s current dock install guide is stricter, at about 30 mm per side on a 2.4, so subtracting 60 mm is safer. Treat the result as a ceiling, not a count. The stock gantry can’t travel the full length of X, so where the docs’ table lists your printer, its figure wins. Docks also cost build height, because the nozzle can’t reach full Z under the dock row.

How much does a StealthChanger build cost?

The design files are free. With LDO’s kits from West3D, a 300 mm Voron 2.4 costs $246.70 for one tool and $546.20 for six (listed October 14, 2026). That covers the shuttle, probe, toolboards, docks, tophat and panels. You still buy a hotend, an extruder and printed parts for each tool, and often a bigger power supply.

LDO sells the kit as three sub-kits, separately or as one bundle. US prices as listed on October 14, 2026, sorted by price:

Item	Contents	Price
Backplate hardware kit	Pins, magnets and screws for 6 tools	$24.99 (West3D)
Fysetc CNC shuttle kit	Shuttle with screws, magnets and belt holders	$29.99 (Fabreeko)
LDO CNC shuttle kit V1.1	Shuttle and mounting hardware	$37.99 (West3D)
Sub-kit 2: Toolhead and Dock (per tool)	Nitehawk-36 toolboard (SC edition), OptoTap, RGB Sequin LED (user-soldered), LDO fans, dock parts	$59.90 (West3D)
Sub-kit 1: Base (once per printer)	CNC shuttle, Nitehawk-Hexa 6+1-port USB hub, CNC SexBall calibration probe, hardware and cables	$89.90 (West3D); $89.99 at Fabreeko, sold out
Sub-kit 3: Tophat and Door Buffer	Tophat extrusions, door-buffer crossbar, clear PC panels, hardware	$96.90 (300 mm), $99.90 (350 mm) (West3D)
Full bundle, 1 to 6 tools	Sub-kits 1 and 3 plus one sub-kit 2 per tool	$246.70 to $546.20 (300 mm), $249.70 to $549.20 (350 mm) (West3D)

Other resellers listed by DraftShift: KB-3D, Isik’s Tech (US); Bobcat 3D (Canada); 123-3D and One Two Enterprises (UK); Levendigs, MyRigs3D, Zen3D Laboratories and 3D Jake (EU); and DREMC (Australia).

Cost per extra tool

With the LDO kit, each extra tool costs $59.90 plus the hotend and extruder you choose. The TeamFDM post puts each tool at roughly $100 to $200 in parts for a hotend, an extruder and a CAN toolhead board.

Power is the cost people miss. The docs’ worked example for six tools (one 70 W heater at full power, five held at 30%, plus fans and extruder motors) comes to about 280 W at 24 V for the toolheads alone and about 400 W with the printer’s 120 W baseline. The toolheads alone exceed the standard Voron 200 W, 24 V supply. Plan on a second supply or a larger replacement.

What the DIY bill of materials includes

If you print the shuttle instead of buying a CNC one, the wiki’s bill of materials uses standard Voron and Voron Tap hardware:

• Shuttle. Three 6 × 3 mm N52 magnets, three 4 × 6 × 6 mm brass bushings, plus M3 screws (two M3 × 40 mm screws are optional stiffeners).
• Each backplate. Three Ø4 × 12 mm dowel pins with rounded ends, one 6 × 3 mm N52 magnet, two magnetic (non-stainless) M3 countersunk screws for preload, four M3 heat-set inserts and one OptoTap sensor PCB. Some toolheads need extra screws.

The wiki stresses real N52 magnets, because weak ones let the umbilical tug the tool and spoil probe accuracy. It also asks for dimensionally accurate prints, since the pins and bushings mesh at tight tolerances.

Which toolheads work with StealthChanger?

Nine toolheads are officially supported: A4T, Anthead, Archetype BlackBird, DragonBurner, JabberWocky, RapidBurner, StealthBurner, XOL and Yavoth. The Mini StealthBurner works through a usermod. Each one needs only its StealthChanger backplate, plus a spacer on some. Any extruder and hotend the toolhead accepts will work.

Toolhead	Author	Dock width
Anthead	Printers For Ants	Standard (60 mm)
DragonBurner	chirpy2605	Standard (60 mm)
Mini StealthBurner (usermod)	Voron Design	Standard (60 mm)
RapidBurner	chirpy2605	Standard (60 mm)
Yavoth	chirpy2605	Standard (60 mm)
A4T	Armchair Heavy Industries	Wide (76 mm)
Archetype BlackBird	Armchair Heavy Industries	Wide (76 mm)
JabberWocky	kinematicdigit	Wide (76 mm)
StealthBurner	Voron Design	Wide (76 mm)
XOL	Armchair Heavy Industries	Wide (76 mm)

The docs’ community recommendation is Anthead, whose fan ducts have built-in magnets that steady the tool while docking. LDO’s Toolhead and Dock kit includes all the Anthead hardware except the extruder and hotend.

Some toolheads have catches:

• XOL and A4T on a Voron 2.4. These need low-profile Z joints. With the stock joints, the Z carriages bottom out on the deck panel.
• DragonBurner. Some extruders need the extended extruder mount.
• Extruders. A wide extruder, or a tension screw that sticks out past the tool, can hit the neighboring tool and cut the tool count.
• Hotends. The docs warn that high-flow hotends can take serious tuning to stop oozing on the way to and from the dock.

Toolhead boards

Every tool needs its own toolhead board and its own OptoTap. Klipper checks which OptoTap is triggered to tell which tool sits on the shuttle. The docs list these boards:

Board	Maker	Protocol	Fan outputs
EBB36 V1.2	BigTreeTech	CAN	2
SB2209	BigTreeTech	CAN, USB	2
SHT36 V2	Mellow	CAN	2
NitehawkSB	LDO	USB	2
EBB36 Gen2	BigTreeTech	CAN, USB	3
Nitehawk36	LDO	USB	3
H36 Combo	Fysetc	CAN, USB	4

Probing is Tap only. The FAQ says no other probe works with the printed parts or with Klipper’s one-probe limit. Per-tool offset calibration is covered in toolchanger tool offsets.