I enlarged the holes for the Bit to 7 mm and reinforced the weak corner.
In this model magnets (5 mm x 1,9 mm) from GIZEH cigarette papers are used, just glued in from the top.
The M5 nut has to be put in place while printing.
BitHolder_GSR_12V-15_Gizeh_Magnets_.stl | 639.4KB |