I don't know about making a straight razor with 3d printing BUT...my neighbor just got a 3D printer, and he has access to a very resilient ABS plastic. Give him a couple months to get good at his designs, and you might just start seeing some 3D printed razor scales coming out from us...If I can't get them cleaner and quicker than with existing materials, you won;t see anything, but if I can make them worthwhile...you just never know...
-Chris~Head Shaver~