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/intersection-object-experiments
Chaos Core Tech - https://youtu.be/8fIy0f48KUI
Andrew Sink - https://youtu.be/V-WyDesFc7w
Support Maker's Muse on Patreon
50 3D Printing Tips and Tricks - https://gumroad.com/l/QWAh
3D Printing Essentials - https://www.amazon.com/shop/makersmuse