The main thing you need to know, is there are two broad categories of 3D printers you might consider for your classroom, Fused Deposition Modeling (FDM) and Stereolithography (SL). My printer does FDM so that’s what I’m familiar with and able to speak to. I really want to try SL, because it’s totally cool. The most common printers in classrooms today use FDM, but this may change in the future.
In a nutshell, Fused Deposition Modeling printers melt plastic and push it out through a nozzle like a hot glue gun. The nozzle in this case is much smaller and hotter than a glue gun, however. The printer builds the object up one layer at a time.
Stereolithography printers use a liquid resin. The resin solidifies when a light is shined on it. These printers also build an object one layer at a time, but the do so a bit differently. The light source in an SL printer will either be a laser that traces a path similar to an FDM printer or a DLP projector that will simply project an image of the whole layer at one time. Once the layer at the top of the liquid solidifies, the printer lifts the growing object and the next layer is illuminated.
If you’re looking for more resources to get you started I’d recommend:
- Make: 3D Printing: The Essential Guide to 3D Printers
- The Invent To Learn Guide to 3D Printing in the Classroom: Recipes for Success
- Printrbot Learn
- Make Magazines 3D Printing Site
Continue to Part 2 in the series.