May 14, 2026
Description
Look at the pictures. You will see that the 8mm spaced holes in LEGGO Technic pieces line up with the 10mm spaced holes of GraviTrax walls every 40mm. These 3D printed pieces take advantage of this fact. They can be used to tie GraviTrax PRO walls and pillars together using LEGGO Technic pieces and pins.
NOTE: THE FIT IS VERY TIGHT! Assembly requires putting pressure to place the pieces under tension. Sometimes you will have to insert Technic pins one at a time and then slip the Technic beams over the ends of the pins. It's not easy. It wasn't intended to be.
The result is a GraviTrax tower that acts like a monolithic single piece structure. Do you see the oval holes? Those are part of my balcony pin mounting system. So you can mount GraviTrax tiles or use with my cheese slope marble run add-on pieces for LEGGO cheese slope marble runs and Gravitrax marble runs around the outside of the tower.
I found these pieces printed of Bambu Lab PLA or PETG work fine, and do not break even under the tension after assembly. I created a 90 lb GraviTrax tower and it worked fine. I was able to transport it and set it up as a single piece.
Also see:
Reference videos…
The project:
Tower and cheese slope marble run:
License:
BY-NC
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