Wooden train peg.
thingiverse
My children have this wooden train from a local artisan: http://www.beneschwood.com/product.php?qcc=1006&qcp=1028 It uses wooden pegs to hold the train together, but, kids being kids, they tend to break the pegs. So, I made a replacement that I could print rather than making them by hand, which is time consuming.
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