Nozzle & SpoolWhich printer to buy, what it'll really cost, and what to avoid.

QIDI Plus4

Published · Researched 2026-09-21

The Plus4 is the deal of this entire comparison and a machine you should think twice about buying. Both things are true: at $649–$699 street, a 370 °C hotend with a 65 °C actively heated chamber is absurd value — and QIDI discontinued it in favor of the Plus5, which means every dollar you save now is a bet against your future self needing parts and support.

What it is: QIDI's 2024 flagship heated-chamber printer — enclosed CoreXY, 305×305×280 mm, 370 °C hotend, 120 °C bed, 65 °C chamber on a 400W PTC heater, Klipper-based open firmware with SSH. Officially discontinued and sold out on QIDI's own site as of September 2026; still buyable from resellers like Fabreeko ($649) and Amazon (~$699, though that listing looked stale in the research) while stock lasts. The successor Plus5 launched August 2026 at $749 — a hundred dollars more for the current platform.

What's genuinely good is the engineering-per-dollar, full stop. Owners and reviewers consistently rate it a strong engineering-materials printer: PPS-CF, PAHT-CF, PC, and the rest of the demanding filaments print inside a properly heated chamber on a machine that costs less than a Bambu P1S combo. A six-month Amazon owner called it "by far the most reliable printer I have owned" after 20–30 rolls of filament; 3DPut's 2026 verdict calls it "a specialized tool that delivers." And QIDI's support behavior on known issues is genuinely good — when early 120V-region units suffered melting chamber-heater SSR boards, QIDI shipped revised boards and replacement upgrade kits with coherent instructions, documented three separate ways including an August 2026 Amazon review. Fabreeko's current listing describes its stock as the latest edition with the revised chamber-heater controller. The community Plus4-Wiki is actively maintained (updated days before this research), Orca Slicer profiles are community-tuned, and a six-month-owner cohort exists with genuinely warm verdicts. This is a machine with a real owner base that fixes things.

What's actually wrong is the kind of wrong that compounds. Start with the Z-offset reliability, which the 2026 research elevated from quirk to real ownership cost: the Plus4-Wiki says the stock Z-offset is not fully reliable, and multiple owners report unreliable first layers and gouged plates. Reliable Z on this machine depends on a checklist — nozzle torqued at 300 °C, clean and lubed Z screws, a clean nozzle, a maintained scrubber and cleaning plate — that is maintenance labor, not a setting. One documented owner got a broken filament cutter on arrival, then a firmware update caused the nozzle to rub and scrape after auto-leveling; the +0.1 mm offset workaround then conflicted with the forced pre-print leveling. Cartographer-probe users should know official firmware 1.7.0 introduced breaking changes, the community Cartographer firmware 5.1 has issues, and 5.0 is the recommended version — the probe ecosystem on this machine is version-fragile.

Then the SSR board saga. It's fixed in later units — QIDI shipped revised boards with coherent instructions — but 3DWithUs warns it's unclear which retail stock still contains the old board, so buying now is a small lottery on whether you get the revised controller. Verify before you buy; Fabreeko's "latest edition" claim is a reseller statement, not a guarantee. The firmware duty-cycle cap that QIDI applied as the interim fix made chamber heat-up genuinely slow. Operation is loud: ~63 dB measured at speed, described as "quite loud" with chamber heating running, and there's no official dB spec to argue with. There's a hot-chamber auto-leveling quirk (QIDI's own guidance: don't preheat the chamber before leveling). The chamber also produces VOC smells — carbon filters help, venting helps more.

And then the structural problem: it's discontinued. QIDI's own page says so. The store keeps a "For Plus4" spares section today, but buying into a dead platform in late 2026 means accepting that 2027+ parts and firmware are a hope, not a plan. The September 2026 conversation in owner groups has already moved to "buy the Plus5 instead," with chatter comparing the Plus5 against the Max4 and rivals like the Sovol SV08. The Plus4's verdict is being written in past tense by its own community. That community, to be fair, is still useful: the Plus4-Wiki remains actively maintained and the Orca profiles keep getting tuned, so a buyer today inherits a mature knowledge base — the one thing a discontinued machine can still give you that a brand-new one can't.

Value: at $649 the Plus4 is the cheapest heated-chamber 370 °C printer in existence, and if you need to print PPS-CF on a budget this month and don't mind being your own service department, the math is almost irresistible. But the discontinuation changes the equation: the Plus5 at $749 is the same machine's successor with an active platform, active firmware, and a future. The $100 you save buys you a discontinued platform with a version-fragile probe ecosystem, a Z-offset checklist, and an SSR board lottery. For most buyers in late 2026, the Plus5 is the rational buy and the Plus4 is the bargain-hunter's gamble. Take the gamble only if the $100 matters and the Fabreeko "latest edition" claim checks out.

Bottom line: a brilliant dead-end. The best value in heated-chamber printing, on a platform QIDI has already moved on from.

One last practical note for the bargain-hunters: if you buy the Plus4 now, treat the purchase like adopting a senior dog — delightful, loyal, and you should budget for the vet. Verify the board revision with the reseller before paying, keep the Plus4-Wiki bookmarked, and print the Z-offset maintenance checklist on day one. The owners who love this machine are the ones who maintain it; the ones who don't maintain it become cautionary threads.

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qidi plus4 extra — photo 03

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