Qidi Plus4 Review — Heated Chamber FDM That Punches Above Its Price
The short version: The Qidi Plus4 is a large-format, actively heated-chamber CoreXY printer that excels at engineering filaments. It had a genuinely alarming hardware defect at launch, the QC is inconsistent, and the software experience is rougher than Bambu's. But for printing large ABS, ASA, PC, and Nylon-CF parts without warping, nothing else at $799 comes close.
1. Introduction
If you have spent any time in 3D printing communities over the past two years, you already know that Bambu Lab has become the default recommendation. Their machines are fast, polished, and largely foolproof. But Bambu Lab has a blind spot, and Qidi has been quietly exploiting it.
That blind spot is the active heated chamber. Bambu's P-series and X1 Carbon use passive enclosure heating, relying on residual heat from the bed to warm the trapped air inside the printer. For PLA, PETG, and even small ABS parts, this works fine. For large structural parts in engineering-grade filaments — ABS, ASA, Polycarbonate, and fiber-reinforced Nylons — a passively heated enclosure is a recipe for warping, delamination, and failed prints.
The Qidi Plus4 was designed from the ground up to address exactly this problem. It is not trying to be Bambu Lab. It is not as polished, not as pretty, and not as beginner-friendly. What it is, at its $799 price point, is the most capable heated-chamber FDM printer you can buy without spending significantly more.
That said, Qidi is not a company you should buy from with your eyes closed. This review covers the real-world experience — the good, the bad, and the genuinely alarming — sourced from multiple independent reviews and extensive community feedback from r/QIDI, r/QidiTech3D, and the Qidi Tech Facebook groups.
2. Unboxing & Setup
The Plus4 ships in a large, well-padded box. The machine itself weighs approximately 27 kg (60 lbs) [1], and Qidi has thoughtfully built heavy-duty recessed grab handles into the top of the frame. You will still want a second person to get it onto a workbench.
The printer arrives approximately 95% assembled. The setup process involves removing foam packing, unscrewing four shipping brackets that lock the bed in place, attaching the spool holder to the rear, and plugging in the 5-inch touchscreen [2]. An on-screen wizard then guides you through removing any remaining packing materials, loading filament, and running the initial calibration sequence.
Time from box to first print: approximately 15 to 20 minutes. This is genuinely impressive for a machine of this size and capability.
The box includes a reasonable accessory kit: Allen keys, a flathead screwdriver, a 7mm wrench, a scraper, a glue stick, a USB drive with the slicer software, a spare fuse, lubricant, thermal paste, and a small sample coil of black PLA [3].
Frustrations worth noting: The filament loading process requires you to push the filament firmly into the direct-drive extruder. Because the purge chute exits out the back of the machine into a black channel, it is very difficult to visually confirm whether new filament is actually feeding through before a print starts. Multiple reviewers have reported walking away during the pre-heat sequence and returning to find the machine "air printing" because the filament never seated properly [2].
3. Spec Sheet
All specifications below are sourced from Qidi's official product page and independent third-party measurements. Marketing claims are noted where applicable.
| Specification | Value | Source |
|---|---|---|
| Print Technology | FDM / FFF, CoreXY | Qidi Official [4] |
| Build Volume | 305 × 305 × 280 mm | Qidi Official [4] |
| Max Nozzle Temp | 370°C (bi-metal, hardened steel tip) | Qidi Official [4] |
| Max Bed Temp | 120°C (6mm aluminum substrate) | PCMag [1] |
| Active Chamber Heater | 400W, max 65°C | Qidi Official [4] |
| Chamber Heat-Up Time | ~8 minutes to 65°C | PCMag [1] |
| Max Print Speed | 600 mm/s (marketing claim) [UNVERIFIED at real-world quality] | Qidi Official [4] |
| Acceleration | 20,000 mm/s² | Qidi Official [4] |
| Extruder Type | Direct drive, 80W heater | Tom's Hardware [2] |
| Nozzle Diameter | 0.4mm (standard) | Qidi Official [4] |
| Bed Leveling | Fully automatic, dual Z-axis motors | 3DWithUs [3] |
| Build Plate | Double-sided PEI magnetic flex plate | Tom's Hardware [2] |
| Camera | 1080p (low-res by default; requires manual config) | 3DWithUs [3] |
| Connectivity | Wi-Fi (2.4GHz), Ethernet, USB Flash Drive | Qidi Official [4] |
| Firmware | Open Klipper (Fluidd interface) | Tom's Hardware [2] |
| Machine Weight | ~27 kg (60 lbs) | PCMag [1] |
| Machine Footprint | 505 × 487 × 550 mm | Qidi Official [4] |
| Supported Materials | PLA, PETG, ABS, ASA, TPU, PA, PC, PPS, CF/GF composites | Qidi Official [4] |
A note on the 600 mm/s claim: This is Qidi's marketing figure. Real-world reviewers consistently print at 200–350 mm/s for quality output. The 3dprint.com reviewer achieved reliable 700 mm/s travel speeds, but print speeds at that rate produce what Tom's Hardware diplomatically calls "a benchy-shaped object" rather than a quality print [2] [5].
4. The Heated Chamber Advantage
This is the section that actually matters for the Plus4's target buyer, so it deserves a thorough explanation.
When you print a high-temperature material like ABS, the plastic is extruded at roughly 240–260°C and immediately begins to cool. As it cools, it contracts. If the layers below it have already cooled significantly, the new layer contracts at a different rate, creating internal stress. In a large part, this stress accumulates until the part either warps off the build plate or cracks along a layer line. This is why printing large ABS parts in an open-frame printer is an exercise in frustration.
An enclosed printer helps by trapping heat inside the chamber, slowing the cooling rate. But a passively heated enclosure — like those found in the Bambu P1S or X1 Carbon — still creates a significant temperature gradient. The bottom of the chamber, near the heated bed, might be 45–50°C. The top of the chamber, near the print head, might be only 30–35°C. For a tall part, the upper layers are cooling in a significantly different environment than the lower layers.
The Plus4's 400W active heater with a circulation fan eliminates this gradient by actively maintaining a uniform 65°C throughout the entire chamber volume [1]. For materials like Nylon-CF, Polycarbonate, and large ABS/ASA parts, this is not a luxury — it is a functional requirement for a successful print.
Community feedback confirms this advantage is real and significant. One user in r/QIDI who had previously owned a Bambu X1C reported that the Plus4 was "on-par or better than X1C and P1S in all the prints I've done with a larger build volume" specifically for engineering materials [6]. Multiple users reported printing large PA-CF and PPA-CF parts with zero warping on the Plus4 that had consistently failed on passively heated machines [5].
5. Print Quality
PLA and PETG
The Plus4 prints standard materials well and quickly. Klipper's input shaping and pressure advance algorithms effectively eliminate ringing and ghosting artifacts even at elevated speeds. The 9mm Gates belts contribute to reduced Vertical Fine Artifacts (VFA) compared to narrower belt systems [3].
Important caveat for PLA users: Because the Plus4's enclosure is so well-insulated, printing PLA with the glass lid closed risks raising the chamber temperature to a point where heat creep causes extruder clogs. Qidi's official guidance and community consensus is to remove the glass lid when printing PLA, TPU, or any other material that requires aggressive part cooling [3]. This is a minor inconvenience but a real workflow consideration.
ABS and ASA
This is the printer's home territory, and the results are excellent. The 3dprint.com reviewer achieved a 0.05mm tolerance on an ASA tolerance test without any fine-tuning [5]. Community users consistently report smooth, glossy ASA surface finishes with zero warping on parts that fill the entire build plate.
PA-CF (Nylon Carbon Fiber)
The combination of the 370°C hardened nozzle and the 65°C chamber makes the Plus4 one of the most capable consumer printers for fiber-reinforced Nylon. The 3dprint.com reviewer printed a full build-plate array of PPA-CF parts with zero warping [5]. Tom's Hardware printed Polymaker PA12-CF parts with layer lines that "absolutely vanished" at 0.2mm layer height [2].
Dimensional Accuracy
The 3dprint.com reviewer measured the following on a 100mm calibration cube without any fine-tuning [5]:
| Axis | Target | Measured | Error |
|---|---|---|---|
| X | 100.00 mm | 100.12 mm | +0.12 mm |
| Y | 100.00 mm | 100.13 mm | +0.13 mm |
| Z | 100.00 mm | 99.99 mm | -0.01 mm |
This is excellent out-of-box accuracy for a machine at this price point. For reference, community users report that CF/GF-infused filaments typically achieve ±0.1mm in real-world conditions [7].
6. Software & Workflow
The Plus4 runs on a customized but fully open version of Klipper firmware. Unlike some manufacturers who lock down their Klipper forks (looking at you, Creality), Qidi gives you full access to the Fluidd web interface, all configuration files, and the Klipper console [2]. You can access the printer directly via its IP address on your local network without registering with any cloud service.
For slicing, Qidi provides Qidi Studio, a fork of Orca Slicer. It is functionally capable, but many experienced users simply use standard Orca Slicer with Qidi's native profiles, which are available on their website [6]. Cura and PrusaSlicer profiles are also available. Switching from Cura to Orca Slicer involves a learning curve — the terminology and workflow differ significantly — but Orca Slicer is the better tool for this class of printer.
UX Pain Points Worth Knowing
The touchscreen is slow. The 5-inch, 800×400 display takes several seconds to load file preview images and can feel unresponsive for a machine at this price point. PCMag called it "one of the biggest disconnects in the experience" [1]. This is a cost-cutting decision that is hard to ignore.
The camera is set to low resolution by default. The built-in 1080p camera streams at a much lower resolution out of the box. Fixing it requires editing a configuration file in the Klipper interface — a trivial task for an experienced user, but a stumbling block for beginners [3].
Wi-Fi performance is poor. The stock Wi-Fi dongle operates only on 2.4GHz and delivers choppy camera streams (often 1–5 FPS) and slow file transfers [6]. Many community users have replaced it with a third-party USB adapter (such as the TP-Link Archer T3U) to get usable performance [6]. Ethernet is available and recommended if you can run a cable.
Re-leveling after plate swap. Every time you flip or swap the magnetic build plate, the printer requires you to re-run the mesh bed leveling routine. This is an extra step that interrupts workflow and is a known firmware limitation [1].
7. Pros & Cons
Pros
Active 65°C heated chamber. No other printer at this price point offers genuine active chamber heating. For engineering filaments, this is a game-changer, not a gimmick.
Large 305×305×280mm build volume. Meaningfully larger than the Bambu P-series (256mm) and competitive with the Creality K1 Max. You can print full-sized helmets, large brackets, and multi-component assemblies in one go.
370°C hardened nozzle. Handles PPS-CF, PA-CF, PC-CF, and other abrasive high-temperature filaments that would destroy a standard brass nozzle.
Fully open Klipper. Complete access to firmware, configuration, and the Fluidd interface. No cloud lock-in required for local printing.
Strong build quality where it counts. 6mm aluminum bed substrate, 9mm Gates belts, dual Z-axis motors with a crossbeam stabilizer, and foam-insulated chamber walls.
Excellent print quality for engineering filaments. When it works, it produces dimensionally accurate, warp-free parts in materials that other printers struggle with.
Cons
The SSR fire hazard at launch was unacceptable. This needs to be stated plainly. Early 110V units shipped with a Solid State Relay (SSR) for the chamber heater that was rated below the actual current draw. The SSR overheated during use, creating a genuine fire risk [8]. Qidi initially denied the problem, then issued a firmware cap limiting the heater to 400W, and eventually shipped replacement heater power boards to affected users [8]. The issue appears resolved in current production units, but the fact that it shipped this way — and that Qidi initially dismissed user reports — is a serious quality control failure.
Z-offset and bed leveling at high temperatures is a known problem. The piezo-based Z-probe used for automatic leveling is sensitive to thermal expansion at high bed temperatures (100°C+). Multiple community users report the nozzle scratching the bed or producing failed first layers when printing ABS or Nylon [9]. This is a documented GitHub issue that Qidi has not fully resolved with firmware. Workarounds exist (calibrating at print temperature, manual Z-offset adjustment), but they require user intervention.
Cloud security vulnerabilities in QIDI Link. A security researcher publicly disclosed that the "QIDI Link" remote access app contained vulnerabilities allowing unauthenticated access to cloud-connected printers [10]. Qidi was given a 90-day responsible disclosure window before the findings were made public. If you buy this printer, use local LAN printing via Fluidd. Do not connect it to the QIDI Link cloud service.
Belt tensioning system is unreliable. The built-in automatic belt tensioner does not work reliably for many users. A significant number of community members have printed aftermarket manual belt tensioners to compensate [11]. Loose belts cause layer shifting and print quality degradation.
Wi-Fi is genuinely bad. The stock 2.4GHz-only dongle delivers poor camera streams and slow file transfers. This is a $799 printer that ships with a Wi-Fi module that belongs in a $200 machine.
Touchscreen is laggy. The 5-inch display is slow and unresponsive in a way that feels out of place on a premium machine.
Not beginner-friendly. The Plus4 requires more user knowledge than a Bambu Lab. You need to understand when to remove the lid, how to adjust Z-offset, and how to navigate Klipper. If you are new to 3D printing, this is not your first printer.
8. Who Should Buy This — and Who Should Not
Buy the Qidi Plus4 if:
You are an experienced 3D printer user who regularly prints functional parts in ABS, ASA, Polycarbonate, or fiber-reinforced Nylon. You need a build volume larger than 256mm. You want open Klipper firmware without cloud lock-in. You are comfortable doing occasional maintenance and troubleshooting. You understand that $799 buys you capability, not polish.
Do NOT buy the Qidi Plus4 if:
You are a beginner who wants a plug-and-play experience. You primarily print PLA or PETG and do not need a heated chamber. You want multi-color printing now (the Qidi Box was still being released as of mid-2025). You are not comfortable with the idea of potentially replacing hardware components. You want the peace of mind of a mature, well-supported ecosystem. In any of these cases, a Bambu Lab P1S or P2S is the correct answer.
9. Comparison
Qidi Plus4 vs. Bambu Lab P1S / P2S
The Bambu P-series is the better machine for most people. It is more polished, has a more mature software ecosystem, and the AMS multi-material system is genuinely excellent. The P1S and P2S are also passively heated, meaning the chamber temperature is a function of the bed temperature rather than a dedicated heater.
For everyday PLA, PETG, and even small ABS prints, the Bambu is the better experience. Where the Plus4 wins is unambiguous: large, tall parts in high-temperature engineering filaments. The 305mm build volume versus Bambu's 256mm is a real difference for full-sized props and large functional parts. And for a 280mm-tall ABS print, the Plus4's active 65°C chamber will succeed where the Bambu's passive heating will likely warp.
The Bambu P2S starts at $549, making it cheaper than the Plus4. The P1S is frequently on sale around $499. If you do not have a specific need for the heated chamber and large volume, the Bambu is the smarter buy.
Qidi Plus4 vs. Creality K1 Max
The Creality K1 Max offers a comparable 300×300×300mm build volume at a similar price point. However, it lacks an active heated chamber entirely, making it a poor choice for engineering filaments. The Plus4's extruder, hotend, and chamber system are substantially superior. Unless you are specifically looking for a large-format PLA/PETG printer and the K1 Max is significantly cheaper at time of purchase, the Plus4 is the better machine.
Qidi Plus4 vs. Qidi Q1 Pro
The Q1 Pro is the Plus4's smaller sibling, and it is an excellent machine in its own right. It offers a 245×245×245mm build volume and a 60°C active heated chamber at roughly $469. If you do not need the Plus4's larger 305mm bed, the Q1 Pro offers most of the same material capability at a significantly lower price. The Plus4 is the better choice if you regularly need to print parts larger than 245mm in any dimension.
| Feature | Qidi Plus4 | Bambu P1S | Creality K1 Max | Qidi Q1 Pro |
|---|---|---|---|---|
| Price (approx.) | ~$799 | ~$499–$549 | ~$549 | ~$469 |
| Build Volume | 305×305×280mm | 256×256×256mm | 300×300×300mm | 245×245×245mm |
| Active Chamber Heat | Yes (65°C) | No (passive) | No | Yes (60°C) |
| Max Nozzle Temp | 370°C | 300°C | 300°C | 350°C |
| Firmware | Open Klipper | Proprietary | Open Klipper | Open Klipper |
| Multi-Color | Planned (Qidi Box) | Yes (AMS) | No | No |
| Best For | Large engineering parts | Everyday printing | Large PLA/PETG | Mid-size engineering |
10. Verdict
The Qidi Tech Plus4 is a genuinely capable machine that occupies a real and underserved niche. If your workflow demands large parts in high-temperature engineering filaments, there is nothing else at this price that competes with its active 65°C chamber, 370°C nozzle, and 305mm build volume.
But you need to go in with clear eyes. Qidi shipped early units with a fire-risk hardware defect, has a documented bed-leveling issue at high temperatures, has a cloud app with disclosed security vulnerabilities, and delivers a software experience that is rougher than what you get from Bambu. The machine rewards users who are willing to learn it, tune it, and occasionally fix it. It punishes users who expect a Bambu Lab experience at a Bambu Lab price.
If you are that experienced user — if you have a drawer full of engineering filament and a need for large, warp-free parts — the Plus4 is one of the best values in 3D printing right now.
FilamentMap Rating: 4.0 / 5.0 — Excellent capability, rough edges. Not for beginners.
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References
[1] PCMag Middle East — "Qidi Plus 4 Review" — https://me.pcmag.com/en/3d-printers/31611/qidi-plus-4
[2] Tom's Hardware — "QIDI Plus4 Review: Bigger is Better" — https://www.tomshardware.com/3d-printing/qidi-plus4-review
[3] 3DWithUs — "QIDI Plus4 Review: 3D Printer Tests, Tips and Settings" — https://3dwithus.com/qidi-plus4-review-3d-printer-tests-tips-and-settings
[4] Qidi Official Tech Specs Page — https://qidi3d.com/pages/qidi-plus-4-techspecs
[5] 3DPrint.com — "Qidi Plus 4 3D Printer Review: Hotter Than The Competition? Is it Safe?" — https://3dprint.com/313877/qidi-plus-4-3d-printer-review-hotter-than-the-competition-is-it-safe/
[6] Reddit r/QIDI — "Opinions on the plus 4?" — https://www.reddit.com/r/QIDI/comments/1hy9g81/opinions_on_the_plus_4/
[7] Reddit r/QidiTech3D — "Accuracy level of Qidi Plus 4" — https://www.reddit.com/r/QidiTech3D/comments/1h1tfza/accuracy_level_of_qidi_plus_4/
[8] All3DP — "Plus4 Issue Prompts Qidi Tech to Offer Replacement Parts" — https://all3dp.com/4/plus4-issue-prompts-qidi-tech-to-offer-replacement-parts/
[9] GitHub QIDITECH/QIDI_PLUS4 Issue #60 — "Z-Offset Calibration Fails at High Bed Temperatures" — https://github.com/QIDITECH/QIDI_PLUS4/issues/60
[10] Reddit r/3Dprinting — "Qidi Security Disclosure" — https://www.reddit.com/r/3Dprinting/comments/1g91nq9/qidi_security_disclosure/
[11] Reddit r/QidiTech3D — "Issues with loose belt on Plus 4" — https://www.reddit.com/r/QidiTech3D/comments/1kfh96z/issues_with_loose_belt_on_plus_4/
[12] GoodPrints3D — "Bambu Lab P1S vs QIDI Plus4" — https://www.goodprints3d.com/blogs/3d/bambu-lab-p1s-vs-qidi-plus4-which-3d-printer-makes-more-sense-for-enclosed-functional-printing-buyers
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