The race to multicolour without purge — four architectures, nine names, side by side

Three years ago, multicolour on a desktop printer meant a filament switcher feeding one nozzle — and a bin full of purged “poop”. By October 2026 almost every major maker has, or is about to have, its own answer to that waste, and the answers differ at the root. This article sets them side by side as each maker publishes them, then shows where the real differences lie.

Four multicolour architectures

The line between the last two is blurring. Prusa INDX calls itself a toolchanger, but each “tool” is only a filament path and a nozzle — closer to nozzle changing than toolhead changing. What actually differs is what has to move, and what gets duplicated: the lighter the moving part, the faster the swap; the more parts multiplied (heaters, fans, motors), the pricier the machine and the more build volume is lost.

Under $1,000

SPARKX i8 — cheapest, fastest swap, fewest materials

The i8 runs four filament channels right inside the hot end and selects one with a mechanism in the toolhead — Creality compares it to a four-colour ballpoint pen. Swaps take under a second and the shared path is about 2 mm³, making it the cheapest near-purge-free approach on the market. The price: one 0.4 mm nozzle for all four colours, an open bed-slinger frame, and no published material list. The maker's “0 g purge” is conditional — the transition is pushed by the slicer into the part's own infill or inner walls. Details in the K3 and i8 article.

Creality K3 — nozzle changing, mixed nozzle sizes

The K3 keeps one toolhead and swaps between four nozzles with its KliTek system: 4.8 s per nozzle, 15 s for a complete colour change. Creality's FAQ (30 Sep 2026) says it has passed over 800,000 high-speed nozzle changes with XYZ deviation under 25 μm, ships with four 0.4 mm brass-tipped nozzles, and allows mixing nozzle materials in one print. Its distinctive feature is mixing nozzle sizes — 0.4 mm for outer walls, 0.8 mm for infill — with a multi-size kit sold separately after launch. TPU 95A works out of the box; 90A and 85A need an add-on kit. Firmware is Klipper-based, rooted out of the box, and OrcaSlicer-compatible.

Snapmaker U1 and Flashforge Creator 5 Pro — same price, different chamber

Both change whole toolheads, both have four, both cost $849. The deciding difference is heat: the U1 stops at 300 °C / 100 °C with only an optional top cover (a passive enclosure); the Creator 5 Pro reaches 320 °C / 120 °C with an actively heated 65 °C chamber. That is why the Creator 5 Pro's material list extends to PA-CF, PPA-CF and PPS-CF. The U1 has the largest build volume in this group and a published 32 mm³/s flow. The full toolchanger comparison is in the multi-toolhead article.

Over $1,000

Bambu Lab H2C — Vortek, and the priciest machine on sale here

The H2C launched on 14 November 2025 and is the basis for every H3C rumour. Its Vortek system holds six swappable hotends connected contactlessly over a high-frequency link, induction-heated to PLA temperature in about 8 seconds; each hotend has memory recording which filament it last ran. With the fixed left nozzle, it prints up to seven colours or materials without purging; add AMS units and it reaches 24, but the eighth and beyond go back to purge-based switching. Bambu Lab's FAQ says firmware supports mixing standard- and high-flow hotends, but does not yet support mixing nozzle sizes in one print — the very feature the K3 is advertising.

The rest is an engineering machine: 350 °C nozzle, 120 °C bed, 65 °C actively heated chamber, flame-retardant enclosure, air filtration, servo extruder. On this list it is the only combination of purge-free changing with enough heat for PC, PA and fibre-filled grades — and the most expensive.

Prusa INDX and Sovol M1D

INDX turns an existing CORE One+ into a 4- or 8-tool machine priming 13 mg per change, at the cost of some build volume and surface-hardened rather than fully hardened nozzles — details in the Prusa INDX article. The M1D combines IDEX with tool changing: two independent heads for printing two copies at once, with the right head swapping among six parked tools. Sovol commits to opening the M1D's hardware, firmware and software in full.

Bambu H3C and P3C — what is known, and nothing more

The names invite readings: the H2C is an H-series machine with Vortek, so the H3C is easily read as its successor; the P3C as a P-series machine with tool changing. That is inference from naming, not an announcement. Bambu Lab has said nothing about either.

In the same period, patent application CN122560413A from Shenzhen Tuozhu Technology was published on 14 August 2026 (priority 6 November 2025, pending). It describes a dock for replaceable printheads in which unlocking the printhead and placing it on the rack happen in one motion, to shorten swap time. Many outlets count the docks in its drawings and attribute them to the H3C; the application names no product, and patent drawings are not a shipping configuration.

Compared by the question you actually have

What more heads don't solve

• —Moisture. Four to eight loaded spools are four to eight spools absorbing water for the whole print. In humid climates PETG, TPU and nylon string within that same print — see how to dry filament.
• —Calibration multiplies by heads. Every nozzle needs a correct offset; every spool needs its own flow ratio and pressure advance. Most machines here measure offsets themselves, but filament profiles are still your job — see the per-spool calibration article.
• —Nozzles become a multiplied consumable. Four brass nozzles printing carbon fibre are four nozzles wearing out together.
• —Purge only disappears up to the heads you have. The fifth colour on a four-head machine purges again. How to estimate that is in the purge-waste article.

The architecture decides how much plastic you throw away. The chamber and temperature ceiling decide which plastics you can print. Those two questions must be answered separately.