This holds cheap lever wire connectors onto the ender 3/pro with Proper Printing's Quick Tool Change system. It allows you to quickly change out the electronics (e.g. fans, thermistor, heater cartridges, etc.) when swapping tools. The design is also parametric so you can easily change the number of connectors that will fit. To do this, you just have to change the value of Amount_Of_Connectors in fusion 360's parameter section.
I use lt-211 wire connectors. Other ones may not be compatible with this design.
The author remixed this model.
I used these as references to model around.