A parametric(well the printed parts at least) grinder rest. It allows you to set and lock an angle.

You'll have to figure out the wooden parts for yourself to suit your grinder, though the photos should give more than enough detail. However, I have uploaded files for the plastic parts you can see. They are about as parametric as you would want, so open the SCAD file in openSCAD and customise away, if you're wondering what the different variables represent, refer to the diagram. Keep in mind that there must be both a left and right-handed angle setter.