The following pic shows the parts that I printed to help me test the integrity of my master cylinder (all M10 x 1.25)
Top - Plugs for a home made reservoir if you don't / can't use the proper reservoir
Middle - Blanking caps for outlet ports
Bottom - MC bleeder line attachment for pipes to return fluid to the reservoir
I was very impressed by the quality and fit of the threads which were printed in PETG (as strong as ABS)
Worth noting that in the MC bleeder kit I purchased originally there was only 1 M10 x 1.20 screw-in bleeder and nothing at all to blank ports so a bit compromising if you have a MC with 3 outlet ports. I had all 3 ports piped back to the reservoir when bench bleeding.
Cheers,
Steve