This holder fits the 25ft Stanley Fatmax.
There's a cutout on the front for the clip, finger slots on the sides to make removal easier and a recess on the left for the tape to slot into. It is designed for #8 GRK washer head screws (which are my favorite fasteners).
I printed this with a brim to help with adhesion, but whether that's needed depends on your setup.
EDIT*** I've added a pegboard version, per a request in the comments. There's also a pegboard sample to print, to make sure that it fits your pegboard without issues. This pegboard version will need supports, as will the sample.
FatMax_Holder.stl | 77.4KB | |
FatMax_Holder_-_Peg.stl | 128.0KB | |
PegBoard_Sample.stl | 44.8KB |