Needed a tool to scribe a piece of architrave and found a drawing on "Be The Pro" website from a guy named Dan Pattison. The design was intended to be whittled from wood but printing is more betterer right?. Bolt holes are pre bored for M5 and it fits together and holds nice and tight.
I actually printed in Wood PLA in a nod to my Namesake who mocked up the design. It turned out fantastic so i hope you like it too. Should print easy enough with any meterial. You might need supports for the nut holes if you decide to use the original orientation. You can probably get away with it by rotating "Scribemiddle" by 90 degrees.