This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/aMP0nG3ISie
Scalable and stackable. It needs minimum support with density of 15%. May need trimming and piling of connectors due to printing excess.
Use Support of touching build plate only with 50 support angle, lines for pattern and density of 50%. For a build plate use brim with line count of 10 and width of 5mm.
Use same scale and orientation to achieve same sizes and be able to connect objects. Trim any excess filament on the connectors to fit into the holes. Remove support from inside with a tweezer.