There are DFM tools that you can use on the back end of your design process e.g. through fictiv/protolabs etc. However there is a lot of stuff that is "technica

There are DFM tools that you can use on the back end of your design process e.g. through fictiv/protolabs etc. However there is a lot of stuff that is "technically machineable" but way more expensive to do, and it really is an engineer's job to both understand how the part is made, talk to the machinists if they don't, and to trade off the design complexity vs. the engineering needs.