Gravitrax Very VERY Long Rail
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An extra long rail for the Gravitrax toy
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My grandkids wanted a REALLY long Gravitrax rail. My Bambu X1C can only print something about 250mm long, and a bit longer if I had printed diagonally. So I designed this rail system. Each piece is 4 standard rail lengths long which is about 235mm long. The pieces connect with a threaded connector piece on one end and a friction fit piece on the other. So in theory, you can use two end pieces and then as many middle pieces as you want.
Here is how I printed it.
Connector: Print it standing up on the non-threaded end. You might want to make the brim a little wider for better adhesion. If you print the two end pieces and one middle piece, you will need 4 connector pieces. If you just copy/paste them, the slicer will place them close together. I found printing worked better if I spaced them apart.
End Pieces: Obviously the overhanging rails on the one end will need a bit of support. I found that the other end, especially if it was a threaded end, benefited from a bit of painted on support just at the top of the opening of the thread. Be sure not to paint very far in because getting supports out of the thread is almost impossible.