

I did end up losing one 'batch' when one part came loose and started causing problems, but I found that was a small price to pay for being able to get a lot of other things done. I printed about 100-200 parts in this manner. The time saved came more from the fact that I could leave the printer for several hours and work on other tasks without having to babysit the printer waiting for it to finish each part.

I found for smaller parts (under 1 inch cube) printing several parts at a time was more convenient, and minimally faster. The issues pointed out by the other posters are all bang on, but one factor that has been neglected is the time it takes you to clear the build plate and restart the print. Printing multiple parts can save you time.
