MiniMarbleRuns — 3D-printable marble run generator

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Prints without supports · simulated physics · free forever

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Publishing adds a thumbnail and your settings to the public gallery. Anyone can open, remix and download it.

🎉 Published! Anyone with this link can open, remix and print it:

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Pick a style, a marble and your printer — everything else is optional.
Every setting updates the model live. Ctrl+Z undoes anything.
Drop marble (Space) runs the physics simulation: rolling resistance, air drag, curve friction, banking, drops and the finish bowl.
Red rings mark problems; click a warning to fly to it. Auto-tune finds a slope that works.
Keys: R surprise · C chase cam · H heatmap · X x-ray · F reset view.

No supports. Every underside is at most the max overhang (45° by default).
0.2 mm layers, 3–4 walls, 10–15% infill. 0.12 mm layers or ironing on the track = smoother, faster runs.
The 3MF keeps track, structure, base and label as separate colours for AMS/MMU printers.
Print the test piece first to check how your ball fits.
The gate card prints flat and slides into the slot at the start.
Steel balls and magnets are choking hazards — keep them away from small children.

Stuck? Report a problem — your current design is attached so we can see it. · FAQ