If you're making circuit boards, you need the flattest possible slopboard. These jigs make it easy - all you need is a drill and some one-foot squares of MDF.

There are two jigs - the Topper version mounts on top of the Snapmaker's slopboard, and the Replacement jig... replaces it. There are two versions of each jig that differ only in assembly - the Part versions are for gluing together, and the Single Piece versions print in one big shot.

I designed this for my video on making PCBs!