UPDATE:
You can find the final version of breadboard kit and parts at the links below:
DSO112A Module for the Modular Breadboard Kit :
https://www.thingiverse.com/thing:3638866
Component Tester Module (blue module show in the pics below)
https://www.instructables.com/id/Component-Tester-Module-for-the-Breadboard-Kit-V2/
Small Modules here:
https://www.thingiverse.com/thing:3416074