Short version: To print something, upload an STL file to http://octopi.loca while at the spacel, wait for slicing to complete, then click the print button.
The Kossel Clear 3D printer, a kit from Blue Eagle Labs, is set up in the front room. It prints with PLA filament. It’s well adjusted and prints most jobs with almost no manual intervention.
There are two ways to use the Kossel, either by using the web interface at Kossel Clear, or by connecting via USB. The web interface is quite reliable, and is preferable unless you have a special need.
The Kossel web interface is provided by the OctoPrint software running on a Raspberry Pi sitting next to the Kossel.