FreeformPillar Coaster
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Freeform marble runs
A freeform run wanders across the printer bed in loops and bends, held up by fins with pointed arches (like a Roman aqueduct) or by thin pillars (like a roller coaster). Every seed makes a different run.
Start from a preset
Each preset opens in the generator, ready to tweak, test and download.
🏛️ Roman aqueductA winding track held up by fins with pointed arches. ★ Uses Pro features (free to preview).
🎢 Pillar coasterA wild, low track on thin pillars, like a roller coaster.
Popular freeform marble runs from the gallery
Freeform
FreeformRoman Aqueduct
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How it works
- The track wanders over the area you choose (by default the whole bed), never turning tighter than the limit you set.
- Where the track crosses itself, pointed-arch tunnels let it pass underneath and still print without supports.
- Supports are either solid fins with gothic arches cut through them, or rows of round pillars.
Settings you can change
| Wildness | From gentle curves to a tangle of loops. |
|---|---|
| Tightest turn | Measured in ball diameters. Tighter turns need more banking. |
| Supports | Fins (with arches, pier width and band thickness) or pillars (with spacing and radius). |
| Fill printer bed | Use the whole bed, or set your own width and depth. |
| Seed | Roll the dice for a new layout with the same settings. |
Every style also lets you pick your printer, marble size (6 mm BBs to 25 mm shooters), groove shape, slope, wall height, base plate, label and colours.
Printing tips
Freeform runs are low and wide, so they stick to the bed well and rarely need a brim. Aqueduct fins are stronger; pillars use less filament and look lighter. Slice with supports off, 0.2 mm layers and 3–4 walls. The full print guide covers slicer settings and troubleshooting.
Other styles
- Spiral marble run towers: A spiral tower winds a track down around a central core.
- Zigzag marble runs: A zigzag run (or drop wall) sends the marble along a ramp, drops it onto the next ramp going the other way, and repeats all the way down.