Free No account needed

IsoCoaster

Free browser designer for isogrid and hexgrid coasters and trivets, with STL, 3MF and STEP export

IsoCoaster is a free browser tool for geometric coasters and trivets in a few minutes. Free, runs in the browser; the maker accepts tips via Buy Me a Coffee. Exports STL, 3MF, STEP and SVG; no account needed. Last checked 2 October 2026.

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Opens isocoaster.app

At a glance

Price: Free, runs in the browser; the maker accepts tips via Buy Me a Coffee
Runs on: Browser
Exports: STL, 3MF, STEP, SVG
Multicolor: No, single color
Account: Not needed
Open source: Yes
Skill level: Beginner: fill in a form
Best for: Geometric coasters and trivets in a few minutes
Selling prints: Allowed The terms say the code is MIT-licensed and that you may print, cut and use your designs commercially, without attribution.
How we checked: Opened the generator Generator loaded without an account: shape, isogrid/hexgrid pattern, relief and edge settings, live 3D preview and STL/3MF/STEP/SVG/DXF export, six shapes, terms read (MIT, commercial use allowed); shared on Reddit by its maker
Last checked: 2 October 2026

Open generator

Sources: IsoCoaster app, IsoCoaster terms of service (MIT, commercial use allowed) (checked 2 October 2026)

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What is IsoCoaster?

IsoCoaster designs coasters and trivets with an isogrid or hexgrid pattern: a lattice of ribs at 0, 60 and 120 degrees, or hexagons, cut into a solid disc. It runs in the browser and is free. You pick one of six shapes (circle, square, pentagon, hexagon and more) and the diameter, the cell size, rib width and corner fillet, and whether a cell or a node sits at the center; optional holes at the nodes add a finishing touch.

Under relief and depth you set the total thickness, how deep the pattern goes and the hole depth, and the edges of the rim and pockets can get a chamfer or a fillet. A live 3D preview shows the result, with the cell count, open area and polygon count, and you can save the whole design as a JSON file to load later.

Exports cover STL and 3MF for printing, a STEP file for CAD and SVG or DXF outlines for laser cutting. The 3MF can be sent straight to Bambu Studio, and an add-in builds it as a parametric model in Autodesk Fusion. The app also shows hints for CNC milling, so the same design works on a router. It suits anyone who wants a good-looking geometric coaster or trivet in a few minutes.