Dueling Zero is a DIY modification of the Voron Zero that gives two printheads separate XY gantries over one build platform. Its alternative to a tool changer is not a proven universal upgrade: it is a different mechanical approach, intended for jobs such as multi-color or multi-material printing and making two parts at once.
What does adding a second gantry mean?
On a typical single-toolhead printer, one head moves through the workspace. A filament-switching system changes which material feeds that head; a tool changer exchanges the head itself. Dueling Zero takes another route: it adds an independent gantry and printhead to a Voron Zero-derived machine. The project describes the two motion systems as operating independently in the same workspace.
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The design pitch is that a print does not need to carry an inactive head along a shared axis, and it does not need a mechanism to swap heads. Those are architectural claims, not measured proof that Dueling Zero is faster, more accurate, or less wasteful than other systems.
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How it compares with other multi-material layouts
These approaches solve related problems but move different components. Hackaday’s February 13, 2024 overview describes the tradeoffs below; it does not provide a controlled benchmark across the designs.
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| Approach | Motion and switching | What it is suited to | Tradeoffs described in the source |
|---|---|---|---|
| Filament switching, such as Prusa MMU or Bambu AMS | One printhead; the system changes which filament feeds it. | Multi-filament printing with a single head. | Material swapping takes time. |
| IDEX | Two hot ends on a shared axis. | Two-tool printing, including jobs that use separate materials or duplicate parts. | Hackaday notes that added moving mass may limit speed and affect print quality. |
| Tool changing, such as the Prusa XL | The printer swaps whole toolheads. | Jobs that benefit from changing tools rather than routing multiple filaments through one head. | Hackaday frames this option as higher cost; the cited article gives no common cost comparison. |
| Dueling Zero | Two printheads, each on an independent gantry; no head-swap mechanism is central to the design. | Two-color or two-material work, and potentially printing two parts at once. | It adds a second motion system and requires a substantial DIY build. Mirror and copy modes depend on firmware support. |
Hackaday characterizes Dueling Zero as having two heads “but thanks to the mechanical design it acts much more like a single-extruder 3D printer in terms of print quality and motion control.” That is Donald Papp’s description of the design, not a result from independent comparative testing. The available sources do not establish a common comparison for speed, acceleration, quality, material waste, or total build cost.
What can you use it to print?
Two-color and two-material prints
Separate heads can handle different colors or materials without relying on a single head to switch filament. The project presents these as intended uses; the actual material combinations and results depend on the builder’s setup and print settings.
Two parts at once
With two toolheads, the design can be used for dual-part printing. Mirror and copy modes are not automatic consequences of installing a second gantry: the project notes that they require firmware support.
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Dueling Zero is documented as a DIY project, not an established off-the-shelf printer. The repository includes parts, instructions, software, and FAQ materials, and says builders can modify a Voron Zero or build the machine fresh. Its September 16, 2023 v3 gantry release is described by the project as using a symmetric, nested belt path derived from Pandora’s Box. The README says that revision reduced unique parts, increased travel, and widened toolhead compatibility; these are the project’s own design notes.
The v3 design shares some components with Voron Zero, but the FAQ says its gantry and printed parts differ substantially. Plan around the documentation for the revision you intend to build rather than assuming a standard V0 parts list will transfer unchanged.
Parts lists vary by example
The repository provides sample builds, not one universal stock configuration. One example lists two MGN7H 300 mm rails; another lists two MGN7H 250 mm rails and a different set of components. Treat rail length and every other component as revision- and build-specific. Before sourcing parts, check the README and documentation for the exact configuration you plan to assemble.
When does a second gantry make sense?
Consider Dueling Zero if you are interested in the mechanics of independent toolheads and are prepared to build and configure a custom printer. It may be a poor fit if your priority is a ready-to-run machine, or if you need published comparative results to choose confidently between architectures. The project FAQ even jokes about the time and cost involved, reinforcing that this is a substantial build rather than a simple add-on.
The Tool Desk
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Sources and project documentation
- Donald Papp, Hackaday, “Tool Changing? Bah! Just Add A Second Gantry” (February 13, 2024)
- Zruncho 3D, Dueling Zero README and documentation index
- Zruncho 3D, Dueling Zero FAQ
Zruncho, the project author, writes in the README: “I hope this project inspires you to build something new, whether a D0 or your own design.”
Quick Recap
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