Summary

I could not find a round adapter to add a USB port to the RXL. I did find one with a rectangular back. If you drill a hole the printer frame, this adapter allows you to mount the rectangular connector in the square hold. It is held in place by the two screws that come with the USB adapter.

Instructions

1) Buy one of these:
http://www.ebay.com/itm/291006032162?_trksid=m570.p2045573.l4769&_trkparms=ga1m%3DT14%26ga2m%3DT1%26ga3m%3DT3%26ga4m%3DT7

2) Drill the appropriate hold for the USB adapter.

3) Remove screws from USB adapter.

4) Hold printed part inside hole while you drill holes for the screw.

5) Mount parts and re-insert the two screws.

NOTE My main hole was a tad bit small (which is what I preferred), so I had to trim the corner of my USB connector with a razor blade to get it in the hole.

I used a metal punch to make my hole as I did not have the appropriate drill bit. I highly recommend using a drill as it is much less stressful.

I'd like to thank my 3rd great aunt once removed on my father's sister's brother's niece's uncle's spouse's side for the care and support. And to Helga Bernice for her continual attempts at humor, and for my neighbors toad who kept me up for hours as this was printed. And my neighbors dog who ate the toad -- the dog is much quieter. And the mailman that delivered my filament. I'd also like to thank the many scientists, engineers, and fellow citizens that developed various things that assist us in life.

USB Adapter Mount for QU-BD RXL or Revolution