A cheap way to get minimal support without the mess or cleanup is to make a sacrificial, solid bridge over the cavity to ground the otherwise floating layers above.

Changing filament in the middle of a print is an easy way to get multi-color effects without a multi-extruder 3D printer. Here's a quick tip for cleaner looking color changes.

Who needs to buy new potentiometer knobs when you can make your own?

A quick shell script to work around failed uploads to OctoPrint

Making light pipes to redirect and diffuse LEDs