Prusa INDX Toolchanger Starts Shipping This Week

Prusa INDX conversion kits have started leaving the factory, and you can order a complete CORE One+ (Gen 2) with Bondtech’s toolchanger already on it — assembled or kit, four tools or eight. Prusa’s August 27, 2026 blog also reopened kit orders and opened CORE One L+ INDX. For makers, the story is whether dedicated melt zones beat a purge tower on a machine you can buy.

What's Happening

This is a shipping note on top of the mid-August CORE One+ / XL+ hardware refresh. Standard-edition INDX kits are moving. Complete printers with INDX included are a new SKU, not only an upgrade path. Configurations are four-tool or eight-tool, kit or assembled. Existing CORE One owners have to pick the kit that matches CORE One+ versus CORE One+ (Gen 2). Prusa is clear that the Founders Edition units already in the wild are not identical: later belts, pulleys, a more open front panel, and firmware and profile updates followed those early machines.

The claimed mechanics are the reason people waited. Each material keeps its own path. Prusa quotes a true toolchange of about 12 seconds from last extrusion of one material to first extrusion of the next on the model, priming outside the print with analog backpressure, and about 13 milligrams to fully prime — no waste tower. Priming pellets are formed for recycling without grinding. Nozzles are induction-heated and low-mass. An eddy-current offset calibration with ambient-noise cancellation is part of the pitch. Then the caution: the nozzles shipping now are surface-hardened rather than fully hardened as Bondtech originally specified. Prusa’s wear tests, not a third-party lab, put practical life at roughly 10 kg of PETG-CF, 5 kg of PC-CF, or 0.5 kg of highly abrasive Ultraglow per nozzle. PLA, PETG, ABS, ASA, TPU, TPE, PVA, BVOH, HIPS, PC, nylon, PP, PBT, and unfilled PC Blend are the “works like a CORE One+ nozzle” list.

Why Prusa INDX Matters for Makers

Single-nozzle multi-material units earn their keep on a two-color keychain. They hurt on a print that swaps every layer: dark-to-light text, soluble supports, TPU over PLA, a 0.4 mm nozzle and a 0.8 mm nozzle in one job. Each swap on a shared melt zone is a flush. Toolchanging moves that cost into hardware — docks, kinematic pickup, eight heaters to manage — and tries to make the swap a dock event instead of a purge. If you already own a CORE One, the conversion kit is the question: is the extra calibration worth never watching a tower grow beside the model?

Keep the jobs separate. Eight tools will not put a continuous tow on a load path. They will let you print a rigid frame, a flexible latch, and a dissolvable support without dragging one polymer through another’s melt pool. That is a garage architecture story. It is also why the nozzle disclosure matters: if your “multi-material” plan was PETG-CF on every tool, you are buying consumable orifices, not a fiber machine.

How Prusa INDX Compares to Other Multi-Material Setups

Architecture	How a swap works	Typical waste / catch
Single-nozzle AMS / MMU	Retract, load, flush one shared melt zone	Purge tower or bucket; time per swap
Dual hotend on one carriage	Two nozzles, one travel system	Oozing idle nozzle; XY offset
IDEX	Two independent carriages	Two materials, not eight; park ooze
This Bondtech toolchanger	Dock a whole tool; prime ~13 mg (vendor)	More hardware; surface-hardened nozzles
Continuous-fiber co-extrusion	Thermoplastic plus a designed tow	Wrong tool if you wanted eight colors

What the Research Says

Solodov, Sydorov, Olkhovska, and Ibulaiev compared four FFF multi-material layouts: dual hotend, IDEX, automatic filament switching (MMU/AMS-class), and toolchanging. Using published experimental data and their own estimates, they put toolchanger waste at about 170 times lower than MMU/AMS-style switching and estimated roughly 2.8 hours saved on a model with 200 material changes. They describe Maxwell kinematic couplings — three balls, three V-grooves — as the usual way to get 1–5 µm XY repeatability when a tool comes back to the carriage. That is a review with model estimates, not a coupon test of Prusa’s 13 mg claim. Use it as architecture literacy: the waste lives in the shared melt zone, and a docked tool is how you stop paying that tax (Solodov et al., 2026).

The coupling itself is older than desktop FFF. Slocum’s review of kinematic couplings walks through why three-ball, three-groove contacts repeat in the micron range when they are kept clean and preloaded, and why a fourth contact fights the first three. Toolchanger printers borrow that machine-tool idea so a parked hotend can return to the same pose. Dirt, thermal growth, and a light hobby preload are the practical enemies. If INDX’s eddy-current offset calibration exists, it is because a perfect Maxwell joint on a plastic printer is still a wish (Slocum, 2010).

Frequently Asked Questions

What is Prusa INDX?

It is Bondtech’s toolchanger for Prusa CORE One printers: up to eight independent toolheads, each with its own filament path. Prusa started shipping standard-edition conversion kits this week and opened complete CORE One+ (Gen 2) printers with INDX already installed. You swap tools instead of flushing one shared hotend.

How much filament does a Prusa INDX toolchange waste?

Prusa says a tool is fully primed with about 13 milligrams of plastic, priming outside the print, with no purge tower. Treat 13 mg as the company’s figure, not an independent lab coupon. Single-nozzle changers still flush a shared melt zone; that is the waste this architecture tries to avoid.

Can Prusa INDX print carbon-filled filament?

Prusa says the nozzles are surface-hardened, not fully hardened as Bondtech originally specified. It lists PLA, PETG, ABS, ASA, TPU, nylon, and other non-abrasive materials. For filled stock it cites about 10 kg of PETG-CF, 5 kg of PC-CF, or 0.5 kg of Ultraglow per nozzle.

Fibricate's Place in This Story

Eight parked nozzles and a continuous tow are different answers to “I need more than PLA.” Companies like Fibricate, whose FibreSeeker 3 continuous carbon fiber 3D printer lays thermoplastic with a tow from feedstock such as the continuous carbon fiber spool, are not shipping an INDX dock or an eight-color purge-free profile. Print fiber when the part is a jig or bracket that should keep a load path. Reach for a toolchanger when the job is rigid plus flexible plus soluble support, or eight colors without a tower. Do not treat chopped-fiber PETG on a surface-hardened nozzle as a substitute for a designed continuous fiber.

What to Watch Next

Watch independent wear tests on those surface-hardened nozzles, and whether Prusa’s promised follow-up on abrasive life includes a fully hardened option. CORE One L+ INDX just opened; XL+ with INDX is still the larger open question from the August refresh. Over the next year, expect more desktop toolchangers at lower prices, and more single-nozzle systems adding faster flushes to stay in the fight. The useful split for 2026–2027 is who is buying dedicated melt zones for color and supports, and who still needs a composite printer sitting next to that machine for parts that have to carry load.

References & Further Reading

1. Solodov, V., Sydorov, Y., Olkhovska, V., & Ibulaiev, V. (2026). Multi-material extrusion-based 3D printing: an analytical review of architectures and prospects of the tool-changing technology. Radiotekhnika.
2. Slocum, A. (2010). Kinematic couplings: A review of design principles and applications. International Journal of Machine Tools and Manufacture.
3. Prusa CORE One+ (Gen 2) INDX, Shipping Has Started, Complete Printers Open for Orders. Prusa Research. Retrieved August 28, 2026.