Prusa CORE One+ (Gen 2) INDX 8-Tool Assembly kit

INDX is a tool-changing system designed by Bondtech and built into this version of the Prusa CORE One+. It lets one printer use up to eight different filaments in a single job: extra colors, a flexible plastic, a dedicated support material, or a mix of those, without you swapping spools by hand mid-print.

Yes. You do not need prior experience, and you do not need a computer if you buy the assembled version. The assembled printer arrives factory-built, calibrated and tested. You attach the screen, the spool holders, and the filament sensors, then follow the on-screen welcome wizard. That setup takes about ten minutes. After that you can open EasyPrint in a browser on a phone or tablet, pick a free model from Printables.com, tap the areas you want in each color, and send the job to the printer.

On this printer, a “tool” is one parked nozzle plus the filament loaded into it. The four-tool and eight-tool versions are the same CORE One+ (Gen 2): same print speed, same enclosure, same 55 °C chamber. The only difference is how many nozzles sit in the front dock, ready to print. The four-tool machine already has empty dock positions on the mounting plate, so you can add four more nozzles later without replacing the printer.

The assembled version reduces the build work: fit the specified external parts and follow the setup wizard. The kit is a substantial mechanical assembly project with a printed handbook, online instructions and the listed tools. Both choices still require the setup and checks specified for that configuration.

Most multi-color printers still have a single nozzle. A box next to the printer (AMS, MMU, and similar systems) feeds different filaments into that one nozzle. Every time the color changes, the printer has to pull the old filament out, push the new one in, and extrude a large amount of mixed plastic until the color runs clean. That waste is printed as a purge tower beside your model. On a complex figurine, there's usually more weight in waste than in the model itself. Each change also takes on the order of 40 seconds. Printers with two switchable nozzles avoid that delay - but only for two materials. Add a third filament and they fall back to the same unload-and-purge process, with the same waste. INDX is a toolchanger, not a filament switcher. Each filament has its own nozzle, sitting cold in the rack until it is needed. There is no shared path through a single hotend, so there is nothing to flush. A change takes about 12 seconds and leaves about 0.013 g of plastic on a small wiper inside the chamber. That is why this page talks about almost zero waste: you are not throwing away a third of a spool with every colorful print.

A purge tower exists because one nozzle cannot hold two colors at once. The old filament has to be pushed out before the new color is clean, and that leftover plastic is printed as a block next to your model. It takes up bed space and, on multi-color jobs, can consume a large share of the spool. INDX never mixes two filaments in the same nozzle, so it does not need that tower. It does still put down a tiny amount of plastic at each swap to stabilize the pressure inside the nozzle. This tiny plastic pellet is approx. 0.013g.

You can use any 1.75 mm filament from any brand. There is no chip in the spool and no requirement to buy Prusament, although Prusament has tuned profiles for this machine. The nozzles in the box are 0.4 mm high-flow, made from surface-hardened nitrocarburized steel. They are the right choice for PLA, PETG, ASA, TPU, polycarbonate, PA11 nylon, PVB, BVOH, and other non-abrasive plastics. The enclosed chamber (up to 55 °C) and 300 °C nozzle temperature are what let you print ASA, PC, and nylon without the warping you would see on an open-frame printer. .Carbon-filled and glow-in-the-dark filaments are abrasive - they slowly grind the nozzle. These stock nozzles will print them, but they are not meant for that as everyday work. After about 10 kg of PETG-CF, 5 kg of PC-CF, or 0.5 kg of Prusament Ultraglow, the print quality may be affected. If you print those materials often, plan on replacing the nozzles they use, or keep those spools on dedicated tools so you are not wearing every nozzle in the dock.

Those two phrases describe how INDX is built, and they are the reason extra nozzles stay inexpensive. On a classic toolchanger, such as the Original Prusa XL, each tool is a complete print head: motor, gears, heater, temperature sensor, and wiring. That is reliable, and it is also heavy and expensive, so adding a fifth or sixth tool costs a lot. INDX splits the job in two. The Smart Head is the one unit that rides on the gantry. It holds the expensive parts: the induction coil that heats the nozzle, the electronics that read temperature without touching the tool, and the extruder motor. That motor also runs a mechanism that tightens or loosens the grip on the filament by itself, depending on whether you are printing soft TPU or a stiff filled plastic. The name INDX comes from those two pieces: IN for induction heating, DX for the dynamic extruder. The tools in the front rack are called passive because they have no electronics. Each one is a filament path and a special steel nozzle - no wires, no heater, no motor, no circuit board. When the Smart Head docks onto a tool, that tool becomes a working hotend. When the head parks it, the nozzle cools on its own because there is no heater block holding heat. Parked tools cannot keep drooling onto the print, and a fifth or eighth material costs a nozzle rather than a whole print head.

A normal 3D-printer hotend is an aluminum block with a heater cartridge and a temperature sensor screwed into it, and a nozzle threaded into the bottom. The printer heats the whole block, and the block heats the plastic. That block has a lot of mass, so it takes time to heat up and even longer to cool down. If you parked a nozzle that was still hot, it would keep leaking filament onto your print. INDX does not use a heater block. The Smart Head contains an induction coil, the same principle as an induction cooktop. When it picks up a tool, the coil creates a high-frequency magnetic field. That field heats the steel of the nozzle itself. Almost all of the energy goes into melting plastic, not into warming a chunk of aluminum, so the nozzle reaches printing temperature in a few seconds. When the tool is parked, there is nothing keeping it hot, so it cools quickly and does not leak. Temperature is measured without a wire to the tool. That contactless reading is how a nozzle with no electronics can still be controlled accurately. The maximum nozzle temperature on this machine is 300 °C.

Yes. You can leave different nozzle diameters in the dock and pick the one the print needs, instead of unscrewing nozzles every time you change a job. Supported sizes are 0.25, 0.4, 0.5, 0.6, 0.8, and 1.0 mm. The printer ships with 0.4 mm high-flow nozzles; the other sizes are sold separately. A common setup is 0.25 mm for fine detail or miniatures, 0.4 mm for everyday parts, and 0.8 mm for large, fast prints or sturdy jigs and fixtures.