Lionel Polar Express Curved Track
thingiverse
My daughter received a Lionel Polar Express train set for Christmas (2016). We both came to the conclusion that this train needs to go around the entire house... so I CAD'd up a compatible piece for the set. Track works great. Here is a link to the straight piece: https://www.thingiverse.com/thing:2004013 I was having issues with the male ends lifting (non-heated print bed) so I added little structures on the end to help with that. You'll need to cut them off with some wire cutters.
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