As I don't use my Inverter directly from the panel but rather to power it from a battery I can't use the intended mounting options (if you want to call it that)
Instead of using some makeshift solution with washers ive sat down to create a proper mounting option
The design is intended to align with the screws sticking out of the back of the inverter to not create a pressure point in the plastic but rather to distribute evenly.
As the nature of the core design is press to fit, the tolerances are very very tight.
Attempt with low filament usage settings and only proceed if this fits.
In order to make it sturdy, please make sure to use enough perimeters and a higher infill
Mine has 6 perimeters with 30 % infill in PETG
The author marked this model as their own original creation.