I have the same printer and spent way too many hours trying to get Motoprint to work. :angry: I think there's another thread dealing with the Motoprint issue in this forum, and I tried everything they suggested as well ... still not working.
Followed all the instructions: installed Motoprint on both PC and my Razr. Worked fine on my PC, but Motoprint on my Razr could not find my printer. Tried a kajillion more suggestions from different forums, the Verizon website, etc. Nothing worked.
I finally took someone's advice about going through Google Drive & Cloudprint...works great. Of course, instead of sending doc straight to my printer, I now have to put it on the Drive and then print through Cloud Print...so an extra step, but a really quick and easy one. Definitely better than pulling any more of my hair out!
Good Luck!