To help with wiring of my MendelMax I build this mount for a WAGO 222-415 power connector (AWG 28-12, 0,08 - 4 qmm, 20A). Also see my tripple mount plate to mount them on the MendelMax
The improved variant simply let more room to get the wires into the frame because the connector is mounted higher than my first one.
Also see the remix (thing:149927) which has a nice idea where to place the holes for the screws.
The STL file for the power connector itself is available at wago.partcommunity.com (registration needed).
This thing was made with Tinkercad. Edit it online https://tinkercad.com/things/0Hefl8jf2pJ
Build it with some support, there is a little nose on the top cliff.