3D cross puzzle

It'a s puzzle that my father made for me a long time ago. I usually make the pieces from wood, but this time, I 3D printed them.

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12 pieces, each identical. (Shown here in 3 different colours.)

have fun figuring out how to put them together!

I printed these in PETG with 0.2mm layers 15% cubic infill. They're pretty much blocks so thicker layers are probably OK, but the 0.2mm layers look good and will help ensure that the pieces fit together well on the top joints.

The model files should print well at the given orientation.

I printed 3 sets of 4 but you could get interesting colour combinations by printing 4 sets of 3 as well. Of course you can also print them all the same colour, too.

The puzzle shouldn't be too difficult, but if you need help putting it together, ask!