Cubic puzzle
thingiverse
Quite easy to solve if you pay attention to the shapes (my 5 y.o. solves it). Easier if you use different colors. Even easier if you print them on the proper orientation so that all insides (or outsides) are facing the same direction.
Download Model from thingiverse
With this file you will be able to print Cubic puzzle with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Cubic puzzle.