I designed a 2 in 1 woodwokring marking gauge. It uses an IKEA pencil (the ones you geht for free at the store) or a nail to mark parallel lines to an edge onto a surface. Its an often used tool at woodworking. You can also use any other normal pencil with similar size. You can choose between the nail or the pencil. The part wich is not needed at that moment can be stored in the rod. In german, this tool is named Steichmaß. You need: the 3d-printed parts 2x M3 screws and nuts 1x M5...
Marking Gauge Marks Curved Edges By Lonn Lorenz — It’s made from two pieces of square stock, the top one slotted to provide adjustment. A thumbscrew locks the setting. I drilled a hole in the top piece to hold a pencil (or an X-Acto) and rounded the business end of the bottom piece to allow it to follow a curved profile. As you scribe, make sure the gauge always stays 90º to the curve. Drawing by Jim Richey