Lego Marble Race Segments

Idea for these three designs from here:
https://www.thingiverse.com/thing:148232

Uses the parametrized lego brick code from here:
https://www.thingiverse.com/thing:615256

12/1/18: Vertical axle holes in the lego supports

3/1/18: 90deg curve middle support moved back onto the lego grid (fixed)

1/1/18: Ramp gets lower sides and 4x2 instead of 6x2 support. 90deg now higher on the outside of the curve.