Here's a short 400μm diameter cylinder (viewed from above, probably about 40μm thick) with a 12μm thick base. I printed it on the #RepRapMicron #3Dprinter, accidentally flooded the slide with about 20-30μm of resin, cured it, and peeled it off. This preserved the fragile base that you can see inside the cylinder. I was actually trying to clean the slide for reuse...
The big pointy thing in the background is a 0.5mm diameter hypodermic needle poked underneath the resin.























