Ratrig V-Core IEC mount with heat inserts
You need heat inserts M3 OD 4.5
I have uploaded 2 versions, 1 with people with AMS to get an even surface ( as in the cover picture ) and there is also 1 version where the RR logo is negative extruded.
I recommend 5 walls top / bottom / perimeters, 30% infill and printed face down.
Printed mine in ABS.