Electric guitar with tone and volume knobs, pick guard, tuning posts, and strings. Drawn in FreeCAD with a freehand polygon, extruded, with top face corners rounded three degrees.

If you're not good at bridging, it will still look fine, but the strings will lay on the guitar. Another alternative is to superglue some real string or fishing line. If you print using 1.75mm, raw filament would work too.

Attribution - Creative Commons

guitar, instrument, musical, fender, electric, prop, music, play, bass, classical, lute, strings