Two-Way Radius Sanding Block

Beta This jig is in beta: the files are generated and checked, but the design may still change. Check the drawing against your instrument before you cut.

What you need to buy

Designations, not links: a shop link dies within months and a dead one reads as a recommendation nobody stands behind any more. Every part here is a standard item you can search for.

Part	How many	What it does, and where such a thing is found
Block (printed part)	1 pc	From the generated filesThe jig itself. A single printed part.
Self-adhesive (PSA) sandpaper roll, width ≥ block width	As needed	Grits: 120–150 for radiusing a fingerboard, 320–400 for fret leveling, 600+ for finishingApplied to the chosen working face.
Spray adhesive for plain sandpaper (if not using PSA)	Optional	Repositionable type is easiest to removeOnly if the sandpaper has no adhesive of its own.
Straightedge ≥ block length	Optional	For checking flatness after printingStep 2, and again whenever a face is trued.

The printed parts are not on this list — you generate and print those. This is what has to arrive in a parcel or come off a shelf.

Start with the coupon