Two Trees SK1 Review 2026 — Klipper Freedom at a Budget CoreXY Price

The Two Trees SK1 arrived in a market where the conversation had already been framed by two camps: Bambu Lab's closed, polished ecosystem and Creality's budget speed boxes running locked-down Klipper forks. The SK1 is trying to be a third option — a Klipper-native CoreXY printer that ships ready to print, requires no firmware flashing, and keeps the ecosystem fully open from day one.

It is not a printer for everyone. But for a specific type of buyer — someone who wants real Klipper without building a Voron, and does not want to pay Bambu prices — the SK1 makes a compelling argument.

Specs at a Glance

Specification	Two Trees SK1
Build volume	256 x 256 x 256 mm
Max print speed	700 mm/s (claimed)
Firmware	Klipper (native, no flashing required)
Extruder	Direct drive
Bed leveling	Automatic (CRTouch/inductive probe)
Nozzle	0.4mm (CHT-style high-flow)
Frame	Open CoreXY
Connectivity	Wi-Fi, USB, ethernet
Display	4.3-inch color touchscreen (Klipper web UI accessible)
Filament sensor	Yes
Power recovery	Yes
Price	~$499–$599

Klipper Native Out of Box — What This Actually Means in 2026

In 2026, saying a printer "runs Klipper" can mean almost anything. Creality's K1 runs a Klipper fork so heavily modified that key features are disabled by default. Flashing real Klipper voids the warranty. Bambu printers do not run Klipper at all — they run a proprietary system that Bambu controls with firmware update gates.

The SK1 is different. It ships with genuine, unmodified Klipper. You get full access to printer.cfg from the moment you unbox it. The Mainsail or Fluidd web interface is accessible on your local network out of the box. Input shaper calibration, pressure advance tuning, and macro customization are all available without any modification.

This matters more now than it did two years ago. The 3D printing community has accumulated an enormous library of Klipper configurations, macros, and tuning guides. A printer that actually speaks standard Klipper means you can pull from that entire knowledge base immediately. Klipper-compatible modifications, community profiles, and OrcaSlicer integration all work as documented rather than "works if you happen to find the right fork."

For an enthusiast who knows their way around printer.cfg or wants to learn, this is the correct foundation. For someone who just wants to press print and walk away, it requires acknowledging that Klipper has a learning curve — but the SK1 at least ships with reasonable default settings that make the initial experience smoother than, say, building a Voron from scratch.

Print Quality

At moderate speeds — 150 to 250 mm/s — the SK1 produces prints that are genuinely good. PLA comes out clean, walls are consistent, and bridges are handled well by the direct drive extruder. PETG at around 200 mm/s is reliable once you dial in retraction settings, which takes one or two test prints but is not a weekend project.

The direct drive setup is a meaningful advantage for flexible filaments. TPU on the SK1 is straightforward, with very little stringing and predictable retraction behavior. This is where the SK1 beats the K1 clearly — the Sprite extruder on the K1 handles TPU, but the SK1's direct drive geometry is better suited for it.

Where the SK1 lags behind the Bambu P1S is out-of-box calibration. The P1S prints well on the first attempt. The SK1 benefits from a proper pressure advance calibration, flow rate verification, and input shaper confirmation before it really hits its stride. None of this is difficult, and Klipper's calibration tools make it systematic — but it does require that initial investment of time, probably two to three hours to set up properly.

Once tuned, quality is competitive with anything in this price range. Fine detail on 0.2mm layer prints is sharp, top surfaces are smooth, and dimensional accuracy is solid for functional parts. The open frame means no enclosure benefit for ABS or ASA — factor that in if engineering materials are a significant part of your workflow.

Speed Reality

Seven hundred millimeters per second is a marketing number. Let us be direct about that. At 700 mm/s, quality degrades to the point where most prints are not usable. Real-world print speeds where the SK1 produces acceptable quality land between 200 and 350 mm/s depending on geometry and filament.

That is still fast. A 0.2mm layer Benchy finishes in under 20 minutes. Larger functional parts that take 3 hours on an Ender 3 finish in under an hour. The speed advantage over traditional bed-slingers is real and meaningful. The 700 mm/s claim just needs to be understood as peak capability, not typical operation.

Input shaper calibration — which you can run yourself via the Klipper accelerometer interface — helps significantly. Properly calibrated, the SK1 maintains quality at speeds that would produce ringing artifacts on an uncalibrated machine. If you take the 20 minutes to run ADXL345 input shaper calibration and set resonance compensation correctly, the useful speed ceiling moves up noticeably.

The honest comparison: the SK1 is roughly as fast in practice as the Creality K1, and slightly behind the Bambu P1S at equivalent quality targets. The P1S's tuning is simply better optimized from the factory.

SK1 vs Bambu P1S vs Creality K1

Feature	Two Trees SK1	Bambu Lab P1S	Creality K1
Price	~$499–$599	~$599	~$349–$399
Build volume	256×256×256 mm	256×256×256 mm	220×220×250 mm
Max speed (claimed)	700 mm/s	500 mm/s	600 mm/s
Firmware	Klipper (native, full access)	Proprietary	Klipper fork (locked)
Enclosure	Open frame	Yes	Yes
Direct drive	Yes	Yes	Yes (Sprite)
Auto leveling	Yes	Yes	Yes
Out-of-box quality	Good after tuning	Excellent immediately	Good after tuning
Ecosystem	Fully open	Partially closed	Semi-open
Noise level	Moderate	Low (enclosed)	High
ABS/ASA support	Limited (open frame)	Yes (enclosed)	Partial (enclosure gaps)
Community Klipper support	Full compatibility	N/A	Workarounds needed
OrcaSlicer integration	Native	Native	Native

The table tells the story clearly. The P1S wins on out-of-box experience and materials range. The K1 wins on price if budget is the primary constraint. The SK1 wins on Klipper openness and is competitive on price for buyers who value the open ecosystem over the enclosure.

Build Quality and Frame

The SK1's frame is aluminum extrusion, similar in construction to a mid-range CoreXY kit. It is not flimsy, but it does not have the precision-machined feel of a Bambu printer. The first thing most owners do is check all the frame fasteners and retighten anything that moved in shipping — this is standard practice for this class of printer and the SK1 is no exception.

The linear rails on both X and Y axes are a genuine quality component. Motion is smooth and backlash is minimal out of the box. The gantry is properly squared on most units, though some report needing minor tramming adjustments.

The build plate is a textured PEI magnetic plate that works well for PLA and PETG. Adhesion is good, removal after cooling is clean. The plate sits on a heated bed that reaches printing temperature in about three minutes, which is acceptable.

The direct drive toolhead is compact and well-mounted. There is no meaningful flex in the carriage under normal printing conditions. Cooling on the toolhead is dual-fan, which provides good coverage for overhangs.

The overall impression is a machine built to a price point, but built competently to that price point. It is not a Voron 2.4 — the construction is less precise and uses more commodity components — but it is significantly more solid than entry-level bed-slingers and holds alignment well over time in normal use.

OrcaSlicer Workflow

OrcaSlicer is the correct slicer for the SK1. Bambu Studio works in theory but is clearly optimized for Bambu printers. Cura works but lacks the Klipper-specific tuning options that OrcaSlicer exposes. OrcaSlicer treats the SK1 as a first-class Klipper printer.

Setting up OrcaSlicer for the SK1 takes about 20 minutes. You create a custom printer profile, enter the build volume and bed shape, set the Klipper connection parameters, and you are printing over Wi-Fi. The calibration tools built into OrcaSlicer — flow rate calibration, pressure advance tuning, and temperature towers — integrate cleanly with Klipper's parameter system. Adjustments made through OrcaSlicer's calibration workflows persist in printer.cfg.

The workflow once set up is excellent. Slice in OrcaSlicer, send over Wi-Fi to Mainsail or directly to Klipper, monitor through the web interface. It is a more involved workflow than Bambu Studio's one-click experience, but it offers substantially more control and visibility into what the printer is actually doing.

For the target buyer — someone who wants to understand and control their printer — this workflow is genuinely better than the Bambu experience, not just different. For someone who wants a printing appliance, it is objectively more friction.

No Cloud — The Open Ecosystem Advantage

This is where the SK1 differentiates itself most clearly from both competitors in this comparison. The Bambu P1S has cloud-dependent features, requires a Bambu account for full functionality, and Bambu's history of account requirements and firmware gate changes has made some users uncomfortable about long-term ownership.

The Creality K1 has Creality Cloud, which is generally considered the weakest software experience among major printer manufacturers.

The SK1 needs neither. Klipper runs entirely on your local network. Mainsail and Fluidd are self-hosted web interfaces. File management, print monitoring, camera feeds, and configuration editing all happen locally. There is no account, no cloud dependency, no risk that the manufacturer's server going down affects your printer.

For print farm operators, this is significant. A farm of SK1 printers can be managed through Moonraker's API, integrated into farm management tools, and monitored without routing traffic through any third-party service. The entire stack from firmware to slicer connection is open source and self-contained.

For home users who have concerns about IoT devices phoning home, the SK1 is as private as a 3D printer gets in this price range.

Reliability and Two Trees Support

Two Trees is not Bambu. The support infrastructure is thinner, the response times are slower, and the community of SK1-specific resources is smaller than the communities around K1 or Bambu printers. This is the honest reality of buying from a second-tier manufacturer.

That said, reliability reports from SK1 owners have been generally positive. The hardware does not seem to develop the recurring issues that plagued early K1 units — extruder clicking, persistent Wi-Fi failures, thermal runaway false positives. The SK1's issues tend to be configuration-related rather than hardware failures, which means they are usually solvable through the Klipper community even without direct Two Trees involvement.

The Klipper community itself is effectively the SK1's support infrastructure for firmware-related questions. Because the SK1 runs genuine Klipper, every Klipper forum, Reddit thread, and documentation page is directly applicable. This partially compensates for the thinner Two Trees-specific support.

Warranty service is standard for a Chinese manufacturer at this price point — available, but slow. Replacement parts for consumables (nozzles, build plates, hotend components) use common standards and are available from multiple suppliers, which is a meaningful advantage for long-term ownership compared to printers with proprietary consumables.

Who Should Buy — Who Shouldn't

Buy the SK1 if:

• You want native Klipper without building a Voron
• Open-source, no-cloud operation matters to you
• You print TPU or other flexibles regularly
• You want full printer.cfg access and macro customization
• You are price-sensitive relative to the P1S and value openness over enclosure
• You plan to integrate with a print farm management system

Skip the SK1 if:

• You print ABS or ASA regularly — the open frame is a real limitation
• You want a plug-and-play experience with minimal configuration
• You need strong manufacturer support infrastructure
• You are a complete beginner — Klipper has a real learning curve even on a pre-configured machine
• The P1S is within budget and enclosure matters — at $599, the P1S offers significantly more out-of-box polish

Final Verdict

The Two Trees SK1 occupies a real gap in the market. It is the printer that answers the question: "What if I want Klipper without assembling a kit?" The answer is a capable CoreXY machine that runs genuine open-source firmware, prints well once tuned, and stays entirely on your local network.

It is not a P1S competitor in terms of out-of-box experience or materials versatility — the open frame and the calibration time required put it in a different category. What it offers instead is full ownership: full firmware access, full configuration control, full independence from manufacturer clouds and ecosystem lock-in.

For the enthusiast buyer at the $499–$599 price point who values openness over convenience, the SK1 is currently the best answer available without building from scratch. For the buyer who wants to press print and get consistent results immediately, the Bambu P1S at $599 is the smarter choice.

Know which buyer you are before you order.

For tuned settings, see our Two Trees SK1 settings guide.