What is a 3D printer?
A typical, modern 3D printer can create a three dimensional object using a molten plastic filament. The objects it can create are usually made from a shape generating computer file created by a CAD (Computer Assisted Design) program.
How does it work?
A 3D printer works much like an inkjet printer. A print head moves across the print bed while extruding a very thin layer of molten plastic. Objects are built in layers from the bottom up. As the printing process proceeds, each layer is overlayed on top of the previous layer.
Most objects created with a 3D printer aren’t solid but instead are shells of the
outside of the object. The inside of the object is usually filled with an “infill”,
which is a cross-
A 3D printer
3D printer filament is available in many different colors and is supplied in spools like these.
If you have an interest in what type of things you can make with a 3D printer, a good place to start is thingiverse.com. “Thingiverse” is a repository for model files that are in the public domain and can be downloaded and used without cost. Model files are usually saved in a format with an .stl extension which stands for “Standard Triangle Language”. There are model files for just about everything you can imagine on thingiverse. If you decide you want to make one of the models with your 3D printer, simply download the .stl file and send the .stl file to the “slicer” of your choice and start printing.
What is a “slicer”?
A”slicer” is a computer program that converts a CAD file such as a .stl file into
code that the 3D printer understands. Generally, the code is in a format called G-
This “Slicer” program is called “Cura” and can be downloaded for free at this site.
To get a better idea of how a 3D printer works, take a look at this short video of a 3D printer in action. (Video is sped up approximately 150x.)
What is a CAD program?
Simply put, a CAD program is used to create original model designs from scratch
or modify existing ones. CAD programs work similarly to other drawing programs with
the added dimension of depth. While some CAD programs can be quite complex to use
and have a steep learning curve, there are also simplified versions that make the
experience much easier. TinkerCAD is a good example of a simplified CAD program.
TinkerCAD is targeted for use by grade schools and is extremely simple to use while
still having powerful tools if needed. Currently, usage of the cloud-
Screen shot of Tinkercad program.
When 3D printers first hit the market, they were fairly crude, expensive and usually sold in kit form. Now that the technology has improved, the prices have dropped dramatically and the 3D printers have become much more mainstream.
If you’re on the fence about purchasing one, most libraries have 3D printers that you can use for free, just bring your.stl model files on a flash card and give it a try.
By Wes Jones
January 20, 2021
Below are photos of some of the models I’ve printed out with the 3D printer.