MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
Or, if you can wait a couple of weeks, and are willing to make or adapt a 2-cell battery box for it, you can get one from Ebay.
I just bought one from them, (won the auction), for $3.95, free shipping, from China. http://www.ebay.com/itm/660nm-5mw-Focusable-Red-Laser-Line-Module-1-pcs-/261313055986?pt=LH_DefaultDomain_0&hash=item3cd778ccf2http://www.ebay.com/itm/660nm-...
Of course it's safer to get the factory part. I just got this one as a spare, along with one that projects a cross. ($5.75).