Earlier, I made a perfect fit fixture for my Shapton Glass stones, but then I realized I have other sized stones as well. So I made a adjustable stand that also is kind of modular.
There are 5 different parts (2 of them are mirrored versions of the other 2 (the stands)).
So this is what you need to print:
The parts are sized to have quite a tight press fit. At least, when printed on my printer, as always, every ones printer have slightly different settings so prints can differ on sub-millimeter levels.
One part that might feel a bit tacky is my use of 3mm rubber bands as "rubber feet" since I had a big pack of rubber bands at home but no rubber feet to keep the fixture from sliding around on the table. How I use them can be seen in the provided pictures. You can of course use whatever you like to keep it from sliding around.
On the side though, there might be a need to use rubber bands to keep the fixtures pressed against the stone. It depends on how tight that press fit between the front and back stands managed to get. That is shown in one of the pictures.
I made it in parts this way to be able to adjust the length of the whole setup, and to be able to customize the parts that grips on to the stone itself. Shapton Glass stones are just 11mm thick with 4-5mm being glass so I don't want to grip to high on those, while on other stones I might want to grip higher.
You might need to rotate parts to get the flat side down, all parts are printable without supports.