O Scale Tunnel Portal for Lionel or MTH Trains One Piece
thingiverse
This is a single piece version of my 0 gauge tunnel portal. I can't update the existing entry anymore so posting this a remix. You can find my original multi piece version here https://www.thingiverse.com/thing:2084060 I'm printing on my ender 3 max with a .8 nozzle. Prints in about 7 hours I did not include the keystone. Since that piece is usually modified it's fine to print it separately and glue it on if you want.
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