BWSTL Free

BWSTL is a parametric 3D shape generator and mesh exporter for makers, 3D printing, DIY TTRPG / Table Top Gaming Set Design, and geometric exploration. The custom formulae sections are a great introduction to geometric principles.

Build shapes from an extensive library — platonic solids, prisms, torus knots, fractals (Koch snowflake, Sierpinski tetrahedron, Menger sponge), parametric and implicit surfaces, spherical surfaces, and custom math-defined forms (f(t) waveforms, f(x,y,z) implicit surfaces, (u,v) parametric surfaces, r(θ,φ) spherical surfaces) — all with live parameter controls and a real-time wireframe or solid-shaded viewport.

Export what you build: 1 stl per 24 hours on the free version.

STL (ASCII or binary, with custom header)
OBJ
3MF, with full Core Spec metadata (title, designer, license, copyright, and more)
Viewport PNG snapshots and turntable GIF animations
Batch export with copyright-stamped folders

Built for real modeling workflows:

10-slot memory library to save and recall work in progress
Full undo/redo history
Printer build-volume settings and auto-chop-to-fit for oversized prints
Light and dark themes, adjustable UI scale

Runs on iPhone, iPad, and Mac — one purchase, every platform.

Privacy first: BWSTL collects no data of any kind and makes no network requests, ever. Everything you create stays on your device. No account, no sign-in, no tracking.