This hook and rail system initially had two sizes of hooks - one which protrudes 12.5mm (half an inch) and one which protrudes 25mm (one inch)  but I am developing a number of accessories which can be used with it, beginning with an adapter to hold 1" sanding belts.

If you have any particular fitting in mind please send me a message and I'll try to oblige.

Or if you would like to design your own - the file to the hook design is linked in the downloads section (you will need a free Onshape account to access it.)

I've printed everything in PLA with standard 0.2mm settings, and 15% infill, but adding an extra perimeter to the hooks might be worthwhile for peace of mind.  No support is necessary for any of the components.

Print two of the mounting clips for each rail section - they will fit in any of the openings including the end ones.

Download the sanding belt file HERE.