I bought mine when I picked up the LX2610 my dealer sold me the LX WSM ( covers the Rops & Cab versions of the LX2610&3310. Was $15 and they furnished the thumb drive.I have been looking around for the LX3310 WSM as well, and have yet to find one posted online as a PDF or a print version.
I had a shop manual for my previous Kubota (B2620) and that proved very useful. With hope the LX3310 one will leak soon.
The paper copy is close to $200 and takes 3 weeks+ to get.