What is you could solve the shape puzzle with only one piece instead of 3? Modelling using Boolean Intersections may be rarely used, but the results are really interesting and well worth experimenting with!

3D Printable Models - https://www.makersmuse.com/intersecti...

Chaos Core Tech -    • 3D Printed Stegosaurus! | ZBrush, Ele...  
Andrew Sink -    • Impossible Object Puzzle - A 3D Print...  

Join the Maker's Muse Community - https://www.makersmuse.com/maker-s-mu...

50 3D Printing Tips and Tricks - https://gumroad.com/l/QWAh

3D Printing Essentials - https://www.amazon.com/shop/makersmuse