v1 of a jig used to hold my 12" jointer blades at a 45 degree angle for sharpening on a granite plate with wet/dry sandpaper.

This is a long print - took about 36 hours for me. The jig in the pictures is in two pieces because I had a Y axis layer shift about two thirds of the way up. It was less than a mm, but enough to mess with the registration of the jig with the blades. Rather than re-print, I cut at the shift line and use the jig in two pieces.