C3 · Wide quarter curve
Turns the track by 90° on three steps, and four of them make the big spiral.
A quarter circle of 150 mm radius. Four C3 stacked with the right heights form one full turn of the large spiral.
- Footprint
- 3 x 3 steps
- Drop
- 15 mm
- Moving parts
- none
- PLA, no supports, 4.2 h
- Bought parts
- none
- Variants
- C3L, C3R
The marble meets the outer wall of a C3 only above about 1.5 m/s. In Round One that speed is reached once, right after the lift, and a brake takes it out again.
Other curves
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