I designed a replacement bridge for violinists (in case the original bridge breaks). I tested it on my sister's violin (I am a cellist, so I just played it like I would a cello) and it actually had comparable sound quality. I designed the bridge such that it uses little filament and has the potential to vibrate more than a solid piece. I would encourage printing this in something durable (I used PETG) and with as many shells as possible and 100% infill. You'll need it. Also, I would encourage printing it on glass.
Print in PETG or something else, something durable but slightly flexible. Nylon would work, probably. Carbon fiber nylon would be even better. You can expect the bridge to shift slightly on the violin when it is playing.