Love the our Samsung front loaders also. No smell but we also do a load of laundry almost every day. We do leave the door open between loads.
Once a month I use that Tide Washing machine cleaner »www.tide.com/en-US/product/tide- ··· ner.jspx
with the sanitize cycle wipe the boot and drain and clean filter. It amazing how much crap builds up in that filter.