Algodoo

Nice idea!

One important function it needs is the ability to control when a droplet gets deposited onto the work table (rather than a continuous stream like you currently have). (Sorry, but it's my turn to nitpick! )

It's not bright idea to set dynamic pos value for every drop. It's better to re-spawn it glued to background (with body=0)

Xray,

I will leave it up to the "3D Printer" designer to figure out how to control the droplet discharge. It should be as simple as advancing the gears 1/16 of a turn to release each drop.

Kilinich,

Thanks for the suggestion. I did it the stupid way first to see if you were paying attention. I figured that if I did some dumb stuff it might lure you out of hiding. Looks like it worked.