Spent some time making some cables this afternoon. Built four 1/4" TRS(m) to XLR4(f) adapters. Three for others and one for me. I also finished up the set of 3 cables for my modified Beyer T70, now I have a 3m 1/4" TRS(m), 3m XLR4(m), and a 1.25m (R/A) 1/8" TRS(m). Portable, single ended, and balanced ready to go.
I used Neutrik NC4FXX-B and NP3X-B terminated Mogami W2893 with Techflex 3/16" Nylon Multifilament. 12" for the three, and 18" for mine.
The T70 cables are Lemo FGG.304.CLAD42Z connectors with Cooner cable 6*26 shielded. The source ends are Neutrik NC4FXX-B, NP3X-B, and NTP3RC-B.
I'm expecting two more HD650 cables from Sennheiser to make the same 1.25m 1/8" TRS(m) and 3m XLR4(m) variants, torn on putting a NP3X-B on the cable that came with my HD650s but I think I'll wait until the plating wears off.