Hey everyone! I teach middle school Technology and Engineering. I am looking for cool small 3D printing projects that middle school age kids can complete. We have 3 Lulzbot printers in my clasroom (2 minis, 1 Taz). I have done things such as spinners, CO2 Cars, desk organizers, phone mounts, chess pieces, and name plates. Some projects are definitely cooler and offer more lessons than others. I especially like ones that fix some sort of problem or require some form of interaction once they’ve been printed. We primarily use Tinkercad.com for designing our objects. I was wondering if the community might be able to offer some new ideas! Please share your thoughts.
One fun quick project if they are new to tinkercad is the puzzle cube, which does not usually take too long, allows for alot of customization, and is pretty fun all round!
We create water rocket with 3Dprinting and louncher too
Projects done at my school are co2 cars, actual rockets launched similar to fireworks, poseable figurines, and for a more open ended one, anything that can move that disassembles to fit within a large kinder egg.
Business-card puzzles are great - they are quick to print, and kids get a chance to quickly see how well calibrated the printer is. 
We will offer some projects this summer in hopes of supplying teachers with a quiver of projects that teach skills and promote problem solving 
Brook
Try this interesting project https://www.thingiverse.com/thing:1193309 is more than 3d printing.