Who Here Makes Their Own Power Cables?

I got the ends from Parts Express and the cable from Lowes.  I used Carol Cable Extension Cord which UL approved.  During assembly I tried various size conductors: 10,12,14 and 16 awg.  I ended up with 12 awg for my amps 14 & 16 for everything else.  That took place years ago and all my gear has changed, some devices many times and never considered any cord changes.  I never considered wire that is not UL approved for purpose.