Free + paid plan Multicolor No account needed

MiniMarbleRuns

Design a marble run that prints without supports, and test it in a physics simulator first

MiniMarbleRuns is a freemium browser tool for a desk marble run sized to your printer and marbles. Free with no account: every run style, the simulator and an STL with MiniMarbleRuns.com on the base. Pro is $49 once for unlimited clean STL downloads, multicolor 3MF, a ZIP of parts, 2 to 4 racing lanes, tube tracks and label text. Commercial is $499 a year to sell prints. Exports STL and 3MF. Last checked 6 November 2026.

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At a glance

Price: Free with no account: every run style, the simulator and an STL with MiniMarbleRuns.com on the base. Pro is $49 once for unlimited clean STL downloads, multicolor 3MF, a ZIP of parts, 2 to 4 racing lanes, tube tracks and label text. Commercial is $499 a year to sell prints.
Runs on: Browser
Exports: STL, 3MF
Multicolor: Yes
Account: Not needed
Open source: No
Skill level: Easy: a few settings to tune
Best for: A desk marble run sized to your printer and marbles
Selling prints: On a paid plan Free and Pro cover personal use, gifts, schools and clubs. Selling physical prints needs the Commercial license ($499 a year), which also puts a verifiable serial number under every print. Selling or sharing the generated STL or 3MF files is not allowed on any plan.
How we checked: Made and downloaded a file Downloaded the default spiral tower (170 mm, 10 mm steel ball) as a free STL without an account on 29 Oct 2026: a valid binary STL with 30,198 triangles. Prices and run styles rechecked on 6 Nov 2026 after the maker's update
Checked by: Mike Janssen
Last checked: 6 November 2026

Open generator

Sources: MiniMarbleRuns pricing, MiniMarbleRuns terms (checked 6 November 2026)

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What is MiniMarbleRuns?

MiniMarbleRuns is a browser generator for 3D-printable marble runs by Jordan Harding, the maker of TerraPrinter. You pick one of eight run styles: a spiral tower with helix lanes around a core, a zigzag drop wall, a freeform aqueduct with tunnels on arches or pillars, a zigzag tower, twin towers joined by a bridge, a wave racer with side-by-side lanes, a vortex cascade from bowl to bowl or a loop-the-loop. You can also start from a preset or press Surprise me. You choose your printer, so the run fits the bed, and the marble you have, from a 6 mm steel BB to a 25 mm shooter marble.

The track settings cover the groove, slope, clearance, wall thickness and height, banking in fast turns and a maximum overhang, so the run prints without supports. A physics simulator drops one to ten marbles down the run, with a chase cam and a speed heatmap, and shows the run time, track length, filament and print time. Runs can be published to a gallery.

The free version downloads the run as an STL with MiniMarbleRuns.com on the base, plus a one-hour test piece to check the ball fit. Pro ($49 once) gives unlimited clean STL downloads without the name on top, a multicolor 3MF, a ZIP of parts, racing towers with two to four lanes, the vortex bowl, a gate start, tube tracks and label text. Every Pro feature can be tried in the preview first. Selling prints needs the Commercial license at $499 a year.