3D Printer Slicer  ·  v1.91 beta
FolgerSlice

Slice. Preview. Print.

A modern, web-based 3D printer slicer with a live WebGL viewport, tree support generation, Klipper integration, and native belt printer geometry. No install. Just open and print.

Launch App See Features
3D
Live Preview
∞
Print Length
0
Installs Needed
1
Click to Print
Designed for real printers

Slice, preview,
and send.

FolgerSlice runs entirely in your browser. Drop in an STL, tune your settings, watch it slice in real time, then hit send — your G-code lands directly on the printer. No file managers, no USB drives, no separate print server UI.


→ Native Klipper / Moonraker integration
→ Live SSE progress stream during slice
→ Belt printer geometry support built in

BELT → Y 45° MODEL GRAVITY Z↑ OVERHANG FACE
Visual identity

The brand.

FolgerSlice
What it does

Every tool you
actually need.

01
Y → ↓Z
Native Belt Geometry
Built from the ground up for 45° belt printers — not bolted on. Slice coordinates live in belt space. Layer normals, wall ordering, and infill all align to the inclined bed automatically.
02
Belt-Aware Tree Support
Support trees understand belt geometry. Branches descend vertically through model space and anchor directly to the belt surface — not the flat build plate. No phantom supports, no wasted material.
03
∞ Y
Unlimited Print Length
Belt printers have no Y-axis cap. FolgerSlice doesn't impose one. Queue parts that span meters, print them sequentially, and the G-code handles handoff automatically.
04
Tree Support Engine
Organic branching with per-node radius accumulation, Laplacian-smoothed paths, and welded mesh preview. Enforcers and blockers let you paint exactly where support goes.
05
Overhang Detection
Real-time face-normal analysis using belt-correct geometry — not Cartesian layer comparison. Overhanging faces light up red as you rotate. Know exactly where support is needed before hitting Slice.
06
Full Support Pattern Library
Lines, grid, zigzag, concentric, and tree. Choose per-object or globally. Normal supports follow the exact overhang shape — no boxy scaffolding where a precise wall would do.
07
3D Live Preview
Three.js WebGL viewport with real-time support mesh, overhang coloring, dimension overlays, and a clickable navigation cube. Inspect your model from any angle before the first layer is laid.
08
Klipper / Moonraker
Slice and send to your printer in one click. Live SSE progress stream shows slicing in real time. Job queue, print status, and G-code download all in the same interface — no separate server UI.
09
Multi-Part Workspace
Load multiple models simultaneously. Per-object settings, full undo/redo history, parts sidebar with visibility toggles. Arrange, scale, rotate — then slice everything together.
The app

See it in action.

folgerslice.com/app/
FolgerSlice — complex 3D test model with overhang detection
folgerslice.com/app/
FolgerSlice — tree support structures generated automatically
folgerslice.com/app/
FolgerSlice — isometric view with tree support on belt printer
Python 3.13 FastAPI Three.js WebGL Precision G-code Klipper / Moonraker Tree Support Engine Shapely / SciPy SSE Progress Stream Farm Print Queue Python 3.13 FastAPI Three.js WebGL Precision G-code Klipper / Moonraker Tree Support Engine Shapely / SciPy SSE Progress Stream Farm Print Queue

Precision slicing. Zero friction.

Launch FolgerSlice