I' ve seen a wooden puzzle like this at a friends house and I liked it a lot but I could find one to buy so I decided to make one.

In order to print it you will need 33 items but only 8 STL files needed.

black filament: 4 x Black_stick_1.stl 4 x Black_stick_2.stl 4 x Joint_1.stl 4 x Joint_2.stl

red filament: 4 x Red_stick_1.stl 4 x Red_stick_2.stl 4 x Red_stick_3.stl 1 x Red_stick.stl 2 x Joint_1.stl 2 x Joint_2.stl

If you print it at 100% it will be very tight and will be difficult to assemble it, although, after 4 times, it is no problem. I suggest to scale it to 110-120%.