@BraceMaker yes there is such service, I have send a file with angle gauges to a water jet cut company.
they came out great, but I now printing them with my 3d Prusa printer.
for the above, I have plenty of new and used plates, front and rear and cutting a piece with an angle grinder is an easy job for me, without needing to outsource it.
but yes, yours is a good idea!
thanks!