3D Printing

3D printing is the process of creating 3-dimensional objects using an additive, such as a plastic (as opposed to a subtractive, such as a CNC machine).

Process to 3D Print a Design

Create or download a 3D design, typically as an STL file.
"Slice" the design with a slicer to produce a g-code file.
Load the g-code file to the printer

Tips:

Closely monitor the print as it begins and check on it periodically
Clean the printer bed between prints with a small amount of rubbing alcohol and a microfiber cloth
A light dusting of cheap hairspray can improve adhesion, especially for glass beds
Each filament will specify temperatures and other conditions required for successful prints
Clean the printer bed between uses with a small amount of alcohol and a microfiber cloth

3D Printing Terminology

G-code file: A file that contains the step-by-step instructions
Raft: A horizontal mesh printed before the first layer to improve bed adhesion or strengthen an otherwise weak base structure. Causes a rough finish on the bottom layer. Often used with ABS filament to prevent warping.
Slicer: Software that converts a 3D model into layer-by-layer print instructions.
STL file: A "stereolithography" file that defines a set of 3-dimensional design in a layer-by-layer fashion.

3D Printing Resources

Breaks'n'Makes provides general advice and entertainment for 3D printing enthusiasts
Eunny covers Tinkercad for use in 3D printing projects
Make Anything YouTube Channel has a lot of fun experiments and projects, plus a great community of helpful enthusiasts.
MakerBot Thingiverse has thousands of free, downloadable 3D designs.
Thomas Sanladerer's YouTube channel has a lot of excellent introductory resources for 3D printing.
Ultimaker Cura is a free slicer that works with most printers.