Factorio Train
thingiverse
The Factorio locomotive made into a keychain! each piece is ~33mm long with the holes in the center being 2mm across I used 7 strand steel beading wire. to thread through the pieces then leaving a little under the length of the last wagon extra to loop back into opposite holes. I jammed a piece of copper wire in to keep it from pulling back out and put a nice gob of super glue on the back to keep it from pulling out. The length is basically as long as you want it to be. I added the Raw models without holes for those making minis (the bottom isnt totally flat)
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