Here are three hobby projects I've worked on during the last 2 years. I've written extensive guides for all of them:

https://github.com/maxvfischer/DIY-CNC-machine A CNC-machine I built using 40x 3d-printed parts.

https://github.com/maxvfischer/Arthur An AI art installation using a GAN network, Samsung The Frame, a button and a PIR-sensor.

https://github.com/maxvfischer/DIY-arcade A full-size Arcade Machine.