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.
If your print is clean / smooth and you apply the silicone lubricant as recommended yes they (mine) will spin by blowing them.... but I can't comments for other peoples prints on other machines. The problem I saw with bearings is cost as you are aware and also getting the sizes exactly right to hold them in tight otherwise you would be messing around with glue etc. This does the job well as it is...