3D print design by Hvmhvm, http://www.thingiverse.com/thing:1645742, 2016.
(fabricated on a Monoprice V2 printer in 2021,
PLA plastic, scale 95%, infill 22%, resolution 0.175mm,
four pieces, assembled printed size 1.5" square)

Here are the other three sides of the assembled puzzle:



The pieces can be paired in either of two ways, and then the two halves slide together:

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