With supports: The “skirt” and added layer above that covering the 6mm hole enable a print without further support. If the perimeters are printed from the inside out, the O-Ring groove can be printed without supports as well.
Without supports: Add your own supports :)
M20: The M20 version works for both motor and inverter, due to it's shallower profile.
M25: The M25 version only works for the inverter!
Recommended Material & Print Settings
0.1mm Layer height for good thread resolution
The M20x1.5/M25x1.5 thread can be tight if there is too much extrusion
The test prints were made with PLA, if you want to use it in a car better use ABS, PETG, …
The O-Ring groove usually does not need support if you have enough outer perimeters (at least on the layer above the groove) and print them from the inside out.
Additional Hardware
3x 49x1.5mm O-Ring
3x M20x1.5 or M25x1.5 Cable Glands
Please consider liking the model and posting a Make. It took a lot of revisions and a lot of filament and O-rings to get this right.
crasbe
