Precision slicing
layer by layer.
A powerful, open-source 3D printing slicer built for speed, precision, and absolute control. Stop fighting your settings and start trusting your prints.
Active Makers
Printer Profiles
Languages
Models Sliced
Built for every printer
Blazing Fast Core
Multi-threaded C++ engine slices complex, millions-of-polygons models in seconds, minimizing wait times and accelerating iteration.
Dimensional Accuracy
Advanced arc fitting and shrinkage compensation algorithms ensure your printed parts perfectly match your CAD models, every time.
Infinite Control
Over 400 exposed parameters. Use sensible defaults for rapid printing, or dive deep into modifier meshes and per-layer logic.
What makes Arcasw stand out
100% open-source slicer
Arcasw is built in the open under a permissive license. Read the source, fork it, ship your own profiles — no telemetry walls, no paid feature tiers, no vendor lock-in to a single printer ecosystem.
The fastest slice you'll feel
Our multi-threaded slicing core (Project Bolt) tears through million-triangle meshes in seconds. Iterate on supports and walls at the speed of thought, not coffee breaks.
Automatic calibration that just works
One-click pressure advance, flow ratio, and input shaping tests generate, slice, score, and write the perfect profile back to your printer — no spreadsheets, no guesswork.
Works with every printer
500+ printer profiles, native Klipper and Moonraker integration, OctoPrint, Duet, Bambu Lab AMS, and Prusa MMU all out of the box. If it extrudes plastic, Arcasw probably already speaks its dialect.
What can Arcasw do for you?
Engineering-grade precision
Variable line widths, adaptive layer height, and arc fitting deliver functional prints that hold tolerances down to 0.05 mm — strong enough for production, smooth enough for display.
AI-assisted setup
Tell Arcasw your printer and filament. Our model picks safe starting parameters in seconds, then learns from your prints to dial in walls, temps, and retraction over time.
Multi-material magic
Paint colors directly on the model, drop modifier meshes for selective infill, and let Arcasw orchestrate purge towers and material changes so the rainbow comes out clean every time.
Feel the simplicity
Unlike other slicers, you don't need to be a CNC engineer to make Arcasw sing. Download the app, plug in your printer, and the first slice is ready in under sixty seconds — with profiles that look exactly the same on every device you sync them to.
Pick up where you left off across up to 5 devices at the same time.
No tracking. No ads. Zero. Nada.
We're dead serious about this one: we don't store your models, your G-code, or your camera feed. Optional analytics are off by default, fully anonymized, and audited every quarter by an independent third party.
We can't sell what we never collected. Read the privacy policy — it's written in plain English.
Engineered for perfection.
We don't just slice polygons; we optimize the physics of melted plastic. Every tool is designed to give you unprecedented control over the final part.
Adaptive Layer Height
Automatically adjusts layer thickness based on model slope. Smooth curves where you need them, speed where you don't.
Organic Tree Supports
Branching support structures that use less material, print faster, and detach with a satisfying snap without scarring your prints.
Multi-Material & Color
Seamless integration with ERCF, MMU, and AMS systems. Paint colors directly on your model with our intelligent bucket fill tool.
Variable Line Width
Dynamically adjusts extrusion width to fill thin gaps perfectly without over-extruding, resulting in stronger, solid top layers.
Pressure Advance Calibration
Built-in calibration patterns to dial in your K-factor. Achieve perfect corners without bulging or stringing.
Per-Object Settings
Print multiple parts with entirely different settings on the same build plate. Different infills, different temperatures, one file.
Cloud Print Queue
Send sliced files directly to OctoPrint, Klipper, or Duet. Monitor progress, temperatures, and camera feeds from your browser.
Time-Lapse Generation
Automatically injects G-code triggers for perfect, layer-synchronized time-lapses of your prints.
We build Arcasw with artificial intelligence at the core.
From day one, AI has been part of how we design, calibrate, and ship Arcasw. We use machine-learning models to tune slicing profiles, generate support structures, predict print failures from your webcam feed, and continually improve our defaults from millions of anonymized print outcomes — so you get a slicer that gets smarter every release.
Our engineering team also uses AI tools every day to write, test, and review code, triage community issues faster, and translate documentation into 47 languages. The result: a tiny team that ships like a much larger one — without compromising on craft.
AI-tuned profiles
Our models analyze your printer, filament, and ambient conditions to recommend slice settings that would normally take hours to dial in by hand.
Predictive failure detection
A trained vision model scans webcam frames in real time, flagging spaghetti, layer shifts, and warping the moment they begin — not three hours later.
Generative supports
Reinforcement-learned branching grows tree supports that use less material, detach cleanly, and respect overhangs the way a careful human would.
On-device, privacy-first
Inference runs locally on your machine by default. Your models, your G-code, and your camera feed never leave your computer unless you explicitly opt in.
Calibration that actually calibrates.
Stop guessing your settings. Arcasw's intelligent calibration engine generates targeted test prints, analyzes your inputs, and dials in perfect profiles automatically.
Hours wasted printing generic torture tests, manually measuring, and guessing values.
Mathematically perfect toolpaths optimized for your specific filament and hardware.
Frictionless Workflow.
From raw CAD data to extruded plastic, completely unimpeded.
Import & Repair
Drag drop STL/STEP. Auto-fix manifold errors instantly.
Paint & Support
Smart organic supports and multi-color bucket fills.
Slice & Analyze
Preview toolpaths, speeds, and volumetric flow rates.
Print & Monitor
Send via WiFi and watch the webcam feed live.
Understand your machine.
Arcasw generates clean, highly commented G-code. Every algorithmic decision, from pressure advance compensation to adaptive layer heights, is explicitly tagged in the output.
No black boxes. No proprietary formats. Just pure, optimized kinematics that you can read, parse, and hack. Build post-processing scripts or debug issues with total visibility into what the slicer is telling your printer to do.
- Verbose commenting system for easy debugging
- Direct Klipper / RepRap macro integration
- Exposed kinematics variables for post-processing
12; Arcasw Optimized G-Code3; Profile: Voron 2.4 - ABS High Speed4; PA: 0.045 | EM: 0.94 | VVol: 24mm³/s56M73 P0 ; start print7G90 ; absolute coordinates8M83 ; relative extruder mode9M104 S255 ; set extruder temp10M140 S110 ; set bed temp1112; [Arcasw: Adaptive Layer Height Init]13; Base Z: 0.20mm | Min Z: 0.08mm14G1 Z0.200 F720015G1 E2 F2400 ; prime1617; [Arcasw: Outer Perimeter - PA Compensated]18G1 X124.53 Y112.44 F480019G1 X124.53 Y152.44 E1.23 F1200020G1 X164.53 Y152.44 E1.2321G1 X164.53 Y112.44 E1.2322G1 X124.53 Y112.44 E1.232324; [Arcasw: Dynamic Infill Density - 18% Gyroid]25G1 F840026G1 X125.1 Y113.2 E0.427...28Print the impossible.
Flawless results across the most challenging geometries.
0.12mm Detail
Overhang Test
Complex Assembly
Trusted by demanding makers.
Don't just take our word for it.
"Arcasw's adaptive layer height algorithm saved me 4 hours on a large cosplay helmet print without sacrificing the smooth curves on the dome. It's the only slicer I use now."
"The built-in calibration tools are a game changer. I used to spend a weekend tuning a new filament. Now I run the automated suite and have perfect flow and pressure advance in under an hour."
"Organic tree supports in Arcasw detach cleaner than anything else I've tried. I'm printing complex miniatures and the supports snap off like brittle glass, leaving zero scarring."
Frequently Asked Questions
Everything you need to know about switching to Arcasw.
Ready to perfect your prints?
Join thousands of makers, engineers, and creators using Arcasw to push the boundaries of desktop manufacturing. Free forever.
Trusted by makers in 90+ countries