Modular Test Bed  M3 or Screwless
Free     Thingiverse     chking

Modular Test Bed - M3 or Screwless

A prototyping modular test bed for Arduino Raspberry Pi and a breadboard These panels are connected together with M3 10mm screws and M3 square nuts or a clip for being completely screw less I also made a modification to the Raspberry Pi panel ...

similar models —

Modular Test Bed - M3 or Screwless alternatives
Customizable Test Tower
ellipticaloptician
Bed Level Test
xx77Chris77xx