A slicer, but it watches your back

ATN Slicer
OrcaSlicer + 40 rules + AI, baked in.

A fork of OrcaSlicer with the askthenozzle.com pre-flight engine and (on Hobbyist) the Diagnose and Ask AI tools embedded as side panels. Catch the failure before you press print. Get expert advice without leaving the slicer.

Download for Windows → See subscription plans

Free download · Windows 10/11 · step-by-step install guide. Pre-flight runs in the panel (1 credit/slice); view the findings on Starter, one-click Apply + AI Diagnose & Ask on Hobbyist.

Inside the slicer

After every slice, before you press print

No upload. No second window. No "did I check that part?". The findings show up in a side panel attached to the gcode preview.

▸ Slicing complete · 46m 35s · 18.4 g · Bambu PA-CF on Bambu X1C

─── ATN PRE-FLIGHT ──────────────────────

[DANGER] Volumetric flow exceeds hotend capacity (24 mm³/s vs ~17 max)

Drop print speed to 200 mm/s or use a high-flow hotend.

[WARN] Min layer time too low — small features will over-melt

slow_down_min_speed=20 mm/s is too high for PA-CF — drop to 8–10.

[WARN] Outer-wall acceleration 12000 mm/s² is high — lower toward 5000 for a cleaner surface

2 critical, 3 warnings caught before you wasted £4 of filament.

What's in the box

Free for everyone first, then what Starter, Hobbyist and Workshop add on top.

A full OrcaSlicer — free

ATN Slicer is a complete OrcaSlicer fork: same hotkeys, same project files, same Bambu / Klipper / Prusa support. Drop-in replacement, nothing to migrate. Free to download and free to keep using with no subscription — we merge upstream Orca changes monthly.

Free for everyone

Mid-air detection — built in, free

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. Runs locally in the slicer; free for everyone.

Free for everyone

Pre-flight on every slice

After each slice, 40+ deterministic checks run on the G-code: 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. Starter sees every finding and can jump to the setting; Hobbyist applies the fix in one click.

Starter views · Hobbyist applies

Material-aware, datasheet-backed

Pre-flight draws on our distilled vendor datasheets — exact temp range, drying schedule, hardened-nozzle requirement — so the checks for Polymaker Fiberon PA6-CF20 (or any catalogued filament) match the manufacturer's spec, not a generic default.

Starter and up

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.

Hobbyist & Workshop · AI

Ask anything, gcode-aware

"Why does this part need supports?" "Cheapest material that handles 80 °C?" The Ask panel is the same AI as askthenozzle.com/ask, but every question already knows what's on the build plate and the settings you sliced with.

Hobbyist & Workshop · AI

Which plan unlocks what

The slicer itself is free to download — features inside are gated by your subscription.

Starter — £3/mo

£3 / month

300 credits

askthenozzle.com web tools
Pre-flight in the browser
Free ATN Slicer download
View the full in-slicer pre-flight — every finding + recommendation
One-click Apply
Diagnose / Ask AI inside the slicer

Choose Starter

Common questions

Why a fork? Why not just a plugin?

OrcaSlicer (like Bambu Studio, PrusaSlicer, SuperSlicer) has no proper plugin API. We tried — the closest you can do is a post-processing script that runs after slicing, but it can't show UI inside the slicer, can't react to settings changes live, and can't add new sidebar tabs. To put a Diagnose panel and an Ask chat next to the gcode preview, we needed a fork. We track upstream Orca closely so you stay current.

Will I lose my existing OrcaSlicer profiles?

No. ATN Slicer reads the same profile format as Orca, Bambu Studio, and PrusaSlicer family. On first launch it offers to import everything from your existing slicer install. The reverse direction works too — print profiles exported from ATN Slicer load in stock Orca.

Does it support my Bambu / Klipper / Prusa printer?

Yes — every printer Orca supports works in ATN Slicer, because it IS Orca underneath. Bambu printer LAN-mode upload, Klipper Moonraker upload, Prusa Connect — all there.

Do the pre-flight checks cost credits?

Pre-flight is 1 credit per slice. A photo Diagnose run inside the slicer is 20 credits — same as on the web. An in-slicer Ask turn is 6 credits. Hobbyist's 900/mo covers a busy hobbyist (pre-flights, one-click Apply, and AI Diagnose/Ask); Workshop's 3000/mo is built for a multi-printer operation and adds the heavy spatial thermal sim + G-code Optimize.

What if I cancel my subscription?

The slicer keeps working as a plain Orca fork — your profiles, hotkeys, slicing all stay. The pre-flight panel and AI panels grey out with a "subscription required" message. Re-subscribe and they wake up.

When can I download it?

Now — the Windows build is a free download from the button at the top of this page. The slicer itself is free; your subscription unlocks the in-slicer features: view the full pre-flight on Starter, one-click Apply + AI Diagnose & Ask on Hobbyist, and the heavy spatial thermal sim + G-code Optimize on Workshop. macOS and Linux builds aren't available yet.

Ready?

The slicer is a free Windows download. Subscribe to read the full pre-flight (Starter), then unlock one-click Apply and the AI panels (Hobbyist).

Download for Windows →

ATN SlicerOrcaSlicer + 40 rules + AI, baked in.