ATN Slicer
OrcaSlicer + pre-flight + AI + physics.
A full OrcaSlicer fork with our 40+ rule pre-flight engine built in — plus, on the paid tiers, AI Diagnose & Ask beside the gcode preview and a Workshop physics suite that predicts warping and heat build-up before you print.
What you get above stock Orca — free
Download it, keep it, no subscription. Three things Orca doesn't do, on by default.
A full OrcaSlicer — free
Same hotkeys, same project files, same Bambu / Klipper / Prusa support. Drop-in replacement, nothing to migrate — it reads your existing profiles on first launch. Free to download and keep, and we merge upstream Orca changes regularly.
FreeMid-air detection — built in
Every slicer warns about overhangs; none tell you when it's about to extrude into thin air. ATN Slicer walks the actual tool-paths and flags any extrusion laid down with nothing beneath it — the spots that fail even with supports on — as red markers right in the Preview.
FreeTop-support-layer fan control
Cool only the interface layer where support meets the part — so the surface releases cleanly and looks sharp — without over-cooling the rest of the support and weakening it. A small, genuinely useful ATN addition, free for everyone.
FreePre-flight on every slice
40+ deterministic checks run on the G-code after each slice: volumetric flow vs hotend, min-layer-time over-melt, supports-off-on-overhangs, chamber-required-for-PA, over-long bridges, footprint-vs-bed fit, a thermal read, and a plain-English explanation of every mid-air spot. Free accounts see a blurred teaser; Starter reads every finding.
Free teaser · Starter reads itRead the findings, then fix them without leaving the slicer
Starter unlocks the full pre-flight. Hobbyist adds one-click Apply and the AI panels.
Every recommendation is a button
Pre-flight doesn't just tell you the outer-wall acceleration is too high — it hands you the corrected value with an Apply button that writes it straight into the profile. Fix a slice in seconds, re-slice, done.
Material-aware, too: the checks pull from our distilled vendor datasheets, so the numbers for Polymaker Fiberon PA6-CF20 (or any catalogued filament) match the manufacturer's spec, not a generic default.
Diagnose a failed print — without leaving the slicer
Print didn't come out right? Photograph it with your phone and drop it on the Diagnose panel. The full Vision-AI pipeline runs — same curated knowledge base, same importable settings patch — with the exact slice settings auto-attached, so it reasons about what you actually printed.
Ask anything, and it already knows your plate
"Why does this part need supports?" "Cheapest material that survives 80 °C?" The Ask panel is the same expert AI as the website — but every question already knows what's on the build plate and the settings you sliced with. No copy-pasting your config into a chatbot.
Engineering-grade physics, on your desktop
Workshop turns the slicer into a print-simulation tool. It runs a licensed local engine that predicts how the part will actually behave — before a gram of filament is laid down.
A warp scorecard for the part
A reduced-FEA solver models the part cooling and contracting layer by layer, then scores its warp and bed-lift risk — accounting for the material's thermal expansion, modulus and crystallisation shrinkage. See at a glance whether that big flat PA-CF bracket is going to curl off the plate.
See where it will move, in 3D
Not just a number — a colour-mapped 3D view of predicted displacement across the part, so you can see exactly which corners lift and which features distort. Reorient, add a brim, or change material and re-check before you commit.
Heat-map the print, catch weak layers
A spatial thermal model walks the toolpath and tracks how hot each region stays between layers — the heat-soak that causes over-melt, droopy tips and glossy mush. It also flags interlayer-bond and delamination (Z-bond) risk where layers land too cool to fuse. See the hotspots as a per-layer heat-map, located in X/Y/Z.
Every risk as a number you can act on
One readout with the hard figures behind the flags: peak interlayer (Z-bond) stress and the layer height it strikes, the warp index and bed-lift driver, plus the material's shrinkage, CTE and modulus. See exactly why a part is at risk — and watch the numbers move as you change orientation, material or a setting.
It learns from your prints
Log a result against a slice and the Learning tab distils what worked and what failed across your own history — surfacing the common causes behind your failures and feeding them back as sharper pre-flight checks tuned to your printers and materials.
Which plan unlocks what
The slicer itself is free to download — features inside are gated by your subscription.
- Free ATN Slicer download
- askthenozzle.com web tools
- Read the full in-slicer pre-flight — every finding + recommendation
- One-click Apply
- AI Diagnose / Ask
- Workshop physics suite
- Everything in Starter
- One-click Apply of every recommendation
- AI Diagnose + Ask inside the slicer (gcode-aware)
- Material-aware, datasheet-backed checks
- Workshop physics suite
- Everything in Hobbyist
- Warp FEA + 3D displacement view
- Heat-soak thermal heat-map
- Delamination / Z-bond risk
- Learning diary
- Local ATN Engine + priority support
Common questions
Why a fork? Why not just a plugin?
Will I lose my existing OrcaSlicer profiles?
Does it support my Bambu / Klipper / Prusa printer?
Do the checks cost credits?
What runs the Workshop physics — is it cloud?
What if I cancel my subscription?
When can I download it?
Ready?
Free Windows download. Subscribe to read the full pre-flight (Starter), unlock one-click Apply + the AI panels (Hobbyist), or add the physics suite (Workshop).
Download for Windows →