3 degree bridge pin reamer

I bought a set of replacement bridge pins for a guitar I was working on, but they wouldn’t seat all the way. After some research, I found that the typical solution is to use a dedicated bridge pin reamer (often around $90) or take the guitar to a luthier for a quick adjustment. Instead, I designed a simple solution. This is a 3D printable mandrel with the correct taper for acoustic guitar bridge pins. By wrapping sandpaper around the taper, it becomes a light-duty sanding reamer that allows you to carefully enlarge or refine bridge pin holes until the pins fit properly. I printed this tool, wrapped it with sandpaper, and was able to adjust all of my bridge pin holes in under a minute. How to use Print the mandrel. Cut a strip of sandpaper (around 200–320 grit works well). Glue the sandpaper around the tapered surface. Insert into the bridge pin hole and rotate gently until the pins seat correctly. Notes: I used 200-grit sandpaper with super glue, but other grits should work as well. Flexible sandpaper works best since it wraps around the taper more easily. Print with higher infill for durability. This simple tool worked perfectly for dialing in the fit of my bridge pins, and I hope it helps others doing guitar setup work.