we have printed on ultraflexx carpet with our hp950 uv printer. never really found a market for it locally. had the rugs carpet bound by a local carpet guy.
like others said, found they had about 6 month life in moderate traffic areas...
biggest issue is the carpet fibers going everywhere and the cleaning of nozzles and printer...the fibers go everywhere and not worth the hassle imo.
have you looked at ultraflexx floor flex? its about an 1/8" thick floor mat that we have found is easy to print on and on a uv printer the inks are really, really
durable. had one in a gym that after a year still looked great.