Someone walks in to your library and says, "I want to learn how to use the 3D printer!" What go-to print do you use to teach the printing process?
I'm the librarian at a junior high campus. I have my students complete the first six lessons on TinkerCAD and then create their own keychain using what they learned. It is sort of like their ticket to print other projects. Our students wear their keychains with pride on their ID lanyards!
We have a 2h Workshop about 3d Printing . 30min a presentation of what is 3d printing and implementations. Another 1.5h to see how to search on Thingiverse and do all the printing proceadure. There is another 1.5 lesson to find out what we can to with tinkercad tinkercad ( https://www.tinkercad.com/ ).
We are printing also ( sometimes ) a keychain of our library. http://www.thingiverse.com/thing:895643
I give them a flyer on the MakerBot and the flyer tells them how to make their own with websites on the back
I made a tutorial on projectignite.autodesk.com called "Make a Gear". It teaches a lot of aspects except navigation on Tinkercad.
We're just launching our printer to the public, so we haven't faced this scenario yet, but we know it's coming! I love all the Things shared below and will try one of each to see how long they take. I have been keeping my eyes peeled for things that print very fast, because the big Things are great to have to display but not as helpful when someone wants to see something start-to-finish. We were printing Things for St. Patrick's Day and found a Thing that prints in around ten minutes and has been really reliable--I don't think it's had any failed prints at all. We charge by the gram, but people don't really have a sense of what one gram equals. This Thing is exactly one gram, so it's been very helpful for that question too. I think this is the file, but it looks a little different now: http://www.thingiverse.com/thing:459232
Usually, a tree frog. However, I can no longer find the thingiverse page of the frog I am referring to. Or, if they want to learn how to design and print, then we use Tinkercad and I have them make a simple Initial letter keychain.
Adults seem to like our Read Keychains (http://www.thingiverse.com/thing:28117). They're quick and reliable, and they have an very obvious use.
For teens and kids we usually go with a Minecraft creeper (http://www.thingiverse.com/thing:157625) because everyone loves Minecraft, or "Cute Octopus Says Hello" (http://www.thingiverse.com/thing:27053) because it almost always prints perfectly.