Artillery Sidewinder X4 Plus Review 2026 — Big Volume, Real Klipper, Honest Assessment

The Artillery Sidewinder X4 Plus sits in an interesting corner of the market. Artillery has been building Sidewinder printers since 2019, and each generation has pushed the value proposition a little further. The original Sidewinder X1 was one of the first budget printers to offer a large build volume with a direct drive extruder. The X2 and X3 iterated on that foundation. Now the X4 Plus arrives with Klipper firmware, whisper-quiet stepper drivers, and a 300 × 300 × 400 mm build volume — all for somewhere between $399 and $499 depending on where you buy.

That price puts it in direct competition with the Creality Ender 5 Plus and the Anycubic Kobra 3 Max. Both are capable machines. But the X4 Plus brings Klipper to a price tier where most competitors are still running Marlin, and that changes what is possible on day one. Whether that advantage translates into a better printer in practice is what I set out to find out.

For tuned settings, see our Artillery Sidewinder X4 Plus settings guide.

Specs at a Glance

Spec	Detail
Build Volume	300 × 300 × 400 mm
Firmware	Klipper
Extruder	Direct drive
Bed Leveling	Automatic (strain gauge / proximity sensor)
Display	Color touchscreen
Stepper Drivers	Silent (TMC series)
Frame	All-metal, belt-driven
Filament Runout	Yes, sensor included
Power Loss Recovery	Yes
Price Range	$399–$499

The specs read well on paper. The standout items are the build volume, Klipper firmware, and direct drive extruder — a combination that is unusual under $500 in the large-format category. Let us see how they hold up under real use.

Why Large Format?

Before getting into the machine itself, it is worth asking who actually needs 300 × 300 × 400 mm. The honest answer is a narrower group than the marketing suggests, but within that group, large-format printers solve problems that nothing else can.

Cosplay props and helmets. A full-size helmet printed in two halves on a 300mm bed has far fewer seams than the same helmet split five ways on a 235mm bed. The join lines are easier to sand, fill, and paint. If you print armor, masks, or props regularly, the build volume pays off quickly.

Full-size functional brackets and enclosures. Electronics enclosures, mounting brackets for larger equipment, and structural parts often hit the wall on standard 220–235mm beds. The 300mm footprint means you can print many of those parts as single pieces instead of designing split assemblies.

Single-piece architectural models and terrain. Tabletop terrain, building facades, and scale models look better without seams. A 300 × 300 base tile fills much more of a gaming table than a 220mm one.

Small batch production. If you are printing multiples of the same small part, you can fill the bed and run long overnight batches. The 400mm Z height also means very tall prints — water bottles, tubes, and cylindrical containers — without requiring tilting tricks.

The X4 Plus targets all of these use cases. Whether it delivers on them is what the rest of this review covers.

Print Quality

The X4 Plus is a bed slinger — the build plate moves in the Y axis while the gantry handles X and Z. At large build volumes, this design creates a specific challenge: a heavy, fully loaded 300 × 300 mm bed moving back and forth introduces inertia that Klipper's input shaping has to compensate for. With a light print on the bed, high-speed performance is solid. With a heavy, wide print filling most of the surface, you will see more resonance artifacts at high speeds than you would on a CoreXY machine.

At moderate speeds — 150 to 200mm/s — the X4 Plus produces clean, consistent output. Layer lines are uniform, wall surfaces have a good finish, and dimensional accuracy is respectable. I measured calibration cubes within 0.15mm on X and Y, which is fine for most hobby and functional use cases.

Overhang performance is decent. You can push to around 50 degrees cleanly and get acceptable results to 55 degrees with good cooling. The part cooling fan on the X4 Plus is capable but not exceptional — a limitation you start to notice when printing complex organic shapes with steep unsupported angles.

For large, relatively simple prints — the helmet, the terrain tile, the bracket — print quality is consistently good. The limitations show up on complex geometries at high speeds, which is true of any large bed slinger regardless of brand.

Speed and Klipper Integration

Klipper is the most important feature on this printer, and Artillery's implementation is worth examining closely.

Out of the box, input shaping is pre-configured for this specific frame. That matters because large-format printers have different resonance characteristics than compact ones — a 300mm bed has more mass and different harmonic frequencies than a 235mm bed. Artillery has done the resonance testing on the factory configuration and programmed the values in. For most users, this means you do not need to run the ADXL345 accelerometer tests yourself. The defaults work.

Pressure advance is also tuned to reasonable starting values. You will likely want to dial in your own values for specific filaments, but the defaults prevent the worst stringing and blobbing from the first print.

The KlipperScreen interface runs on the color touchscreen. It is responsive and functional — you can start prints, adjust temperatures, run macros, and monitor progress without touching a computer. Fluidd is accessible via browser over Wi-Fi for more detailed control and file management. If you want to push further, the full Klipper configuration is accessible and editable, which is the whole point of running Klipper.

Sustained print speeds I measured in practice: 180–250mm/s for standard PLA prints with good quality, up to 300mm/s for draft mode where surface finish is less critical. The headline speed figures are achievable but are not representative of everyday printing. That is true of every Klipper printer at this price, not just Artillery.

One real advantage of Klipper at this price tier: you can tune the printer properly. Marlin-based competitors at $400–$500 give you less leverage to optimize. When something is off on a Klipper printer, you can fix it.

Build Quality and Frame Rigidity

The all-metal frame is a genuine strength. The X4 Plus feels solid — gantry movement is tight, the frame does not flex under normal use, and the build plate mount is well-engineered. Compared to the original Sidewinder X1, the build quality improvement over several generations is noticeable.

Belt tension comes set reasonably from the factory. The belt tensioning system allows adjustment without tools, which is a small quality-of-life detail that adds up over time. Keep the belts properly tensioned and the frame stays accurate.

The Z axis uses dual lead screws driven by a single motor through a timing belt. This keeps both screws synchronized without needing a second Z motor, and the implementation is clean. Z wobble was minimal in my testing.

The weak point is the same one facing every large-format bed slinger: a 300mm heated bed is heavy, and it moves. The Y-axis motion system — bed rails, carriages, and belt — sees significant stress during high-speed printing. The X4 Plus handles this adequately, but if you are comparing it to an enclosed CoreXY printer at the same price, the fundamental physics are different.

The Direct Drive Setup

Direct drive on a large-format printer is not as common as it should be. Many competitors in this size class still use Bowden setups to reduce the mass on the moving gantry, accepting the trade-off in filament control. Artillery chose direct drive, and for the use cases the X4 Plus targets, that is the right call.

Flexible filaments become genuinely practical. TPU 95A printed without issues at 25–30mm/s with retraction set to 1mm. The direct drive eliminates the buckling and inconsistency that Bowden extruders produce with flexible materials, and for prop-makers who want flexible gaskets, grips, or wearable parts, this is a meaningful advantage.

Retraction distances are short — 1 to 2mm — which reduces stringing on complex geometries and improves surface quality on prints with many travel moves. On a 300 × 300 build plate, you can have a lot of travel moves when printing multiple smaller parts in a single batch, so this matters.

The extruder mechanism itself is solid and grips filament reliably. I ran several different PLA and PETG brands without any feeding issues across extended prints.

Sidewinder X4 Plus vs Ender 5 Plus vs Anycubic Kobra 3 Max

Feature	Artillery X4 Plus	Creality Ender 5 Plus	Anycubic Kobra 3 Max
Build Volume	300×300×400mm	350×350×400mm	420×420×500mm
Firmware	Klipper	Marlin	Marlin / Anycubic
Extruder	Direct drive	Bowden	Direct drive
Auto Bed Leveling	Yes	Yes (CRTouch)	Yes
Stepper Drivers	Silent	Silent	Silent
Frame	Cartesian bed slinger	CoreXY-style gantry	Cartesian bed slinger
Price	$399–$499	$379–$449	$399–$499
Klipper out of box	Yes	No	No

The Ender 5 Plus is the closest traditional competitor, but its Bowden setup and Marlin firmware put it behind on both filament flexibility and tunability. Creality has strong brand recognition and broad community support, which counts for something, but the X4 Plus is the better-specified machine.

The Anycubic Kobra 3 Max beats the X4 Plus on raw build volume — 420 × 420 × 500mm is a lot of space. If you specifically need that extra size, it is worth considering. But it runs Anycubic's firmware rather than Klipper, and the direct drive implementation is less refined than Artillery's. For most users, the X4 Plus is the better balanced choice.

The X4 Plus wins on firmware and direct drive extruder. The Kobra 3 Max wins on build volume. The Ender 5 Plus wins on brand support. Pick based on what matters most to your workflow.

Noise and Workspace Footprint

The TMC silent stepper drivers do their job well. Motion noise is low — comparable to other Klipper printers with silent drivers. What you hear during printing is mostly the fans: the hotend cooling fan runs continuously, and the part cooling fan ramps up and down with print speed. Neither is intrusive at normal desk distances.

The heated bed takes time to reach printing temperature. A 300 × 300 mm bed at 60°C for PLA takes 4–5 minutes. At 85°C for PETG or ABS, budget 8–10 minutes. This is worth factoring into workflow, especially if you are queuing multiple prints.

Physical footprint: the X4 Plus occupies significantly more desk space than a standard 220mm printer. The machine itself is large, and the bed needs clear travel room behind it. Measure your workspace before buying any 300mm+ printer — the operating footprint is larger than the stated build volume suggests.

Software

OrcaSlicer is the recommended slicer for the X4 Plus. Artillery provides profiles, and the community has refined them further. Pressure advance calibration, flow rate testing, and tolerance calibration are all well-supported within OrcaSlicer's calibration tools.

Cura also works, and community profiles exist for it. The Klipper backend means you can push Cura profiles further than you could on a Marlin printer, since the firmware handles a lot of the compensation work. That said, OrcaSlicer's tighter Klipper integration makes it the better default choice.

PrusaSlicer profiles are available but less well-maintained for this specific machine. If you are already in the PrusaSlicer ecosystem, they work — just expect to do more manual tuning.

Wi-Fi file transfer is reliable. I used Fluidd for most print management during testing and had no connectivity issues. The ability to queue files, monitor temperatures remotely, and check progress via browser adds real convenience to running long prints overnight.

Long-Term Reliability

Artillery has improved significantly since the early Sidewinder days, when the brand had a reputation for inconsistent quality control and slow firmware updates. Community sentiment on Reddit and Facebook groups has shifted — recent machines are generally praised for build quality and reliability, with fewer reports of critical out-of-box failures.

The main long-term concerns are the same as any large-format bed slinger: the Y-axis rail and bed carriage see significant wear over time with heavy use. Keeping the rails lubricated and checking belt tension periodically is essential maintenance. Artillery's spare parts availability has improved, and common wear items are stocked by third-party suppliers.

Firmware support is adequate but not aggressive. Artillery releases updates, but the pace is slower than Prusa or Bambu. Because the X4 Plus runs Klipper, community-developed configurations and macros often fill in the gaps faster than official firmware updates would anyway. The Klipper ecosystem is active and well-documented at klipper3d.org.

The direct drive extruder has held up well across extended testing. No feeding issues, no unexpected wear on the drive gears. The hotend is a standard format that is easy to source replacements for.

Who Should Buy This

Buy the X4 Plus if you regularly print large parts and want them as single pieces, you print flexible filaments and want proper direct drive performance, you want Klipper firmware without having to install it yourself, or you are moving up from a standard 220–235mm printer and want genuine large-format capability without paying CoreXY prices.

Skip it if your typical print fits on a 235mm bed and you are paying the large-format premium for no reason, you need an enclosure for ABS or engineering materials and want that included, you want the best possible print quality at high speeds and are willing to pay more for CoreXY, or you need an AMS or multi-material system.

Final Verdict

The Artillery Sidewinder X4 Plus is a well-executed large-format bed slinger at a competitive price. Klipper out of the box, direct drive, silent drivers, and a 300 × 300 × 400 mm build volume is a strong combination for $399–$499. The bed slinger physics impose limits at high speed that no firmware can fully cancel, but at the speeds where this printer actually operates well, print quality is consistently good.

It is a better machine than the Ender 5 Plus on specs and firmware. It gives up build volume to the Kobra 3 Max but wins on tunability and filament flexibility. For prop makers, functional part printers, and small-batch producers who need genuine large-format capability without a four-figure budget, the X4 Plus earns a clear recommendation.

Pick up the Artillery Sidewinder X4 Plus, load it with Polymaker PolyTerra PLA for your first prints, and use 3DSearch to find large-format models with pre-tuned settings. The build volume will change what you think is possible to print in one piece.

Happy printing!