This is a caul for clamping a guitar neck. It fits a variety of common guitar neck profiles, including C and D shaped necks. It should fit most 6 string electrics and acoustics.

Important: You need extra wall loops. Mine has 6 wall loops, which seems pretty good for my purposes. 7 or 8 loops is probably overkill. Anything less than 5 would make me nervous.
Print on its side for maximum strength. It needs to be strong because it will be used with a C- Clamp. I printed mine with about 20% honeycomb infill. It's solid as a rock.

The felt I got is from Michaels and has an adhesive backing.

I used approximately 65 grams of material.

Creality

Ender 3

No

No

20%