The original mount didn't fit my use case as I needed it to be offset from teh x axis, my filament is feeding on that plane; I still need to make some further modifications (movement in the z plane to allow from print-head movement, I think) but for what I originally intended this works great.

I'm by no means a 3D model expert this was created by importing the STL into fusion 360, using a plane split and then joining with a cuboid... probably the crudest method but effective for me. Still surprised I managed it with the package interface being what my brain is!

I'm adding this here hoping it's helpful to someone else and to add my thanks to the original creator; your effort is appreciated! cheers.

The case and lid are still required from the original so are not included.

per original descriptions, although you should print using settings tailored to your printer and/or filament.