Toy train female-female Adapter
thingiverse
Handy little piece to connect your toy train or just change the adapter end from male to female for ending your loop :) Designed this one to get all the potentials for this male-only-adapter-crossing i created: https://www.thingiverse.com/thing:4710956 Sorry for messing up the oriantation - of course you want to print it flat! :)
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