Marble Roller, Stackable

This is stackable marble track/roller I designed and printed for my niece and nephew.
There are 3 sections:
- Catch is the bottom Piece to gather the marbles (ball bearings)
- Section A has a loop, small jump and long track.
- Section B has a Rotating spiral, Seesaw and rails.

The sections can be placed in any order. This design is stackable so I could design or print more sections to make it taller. There are 3 different tracks per section, the marble falls down the posts to the ne