I 3D printed a soil block maker over the weekend, and I'm giving it a try now. Seems to work pretty well once you dial in the moisture content of your soil mix. Time will tell how durable it is (I only used 40% infill to save time and materials on this one), but it's basically just an experiment for us to see if we can incorporate soil blocks into our growing. If it works out, I can invest in a larger/more durable one.

This is the file I used (it's not my design) if you're interested in making one of your own: