I printed these with PLA+ with a 4mm nozzle and 0.2mm layer height. I used the default Cura profile for PLA. I advise using raft for adhesion as it will help with the support material removal.
You'll also need magnets from amazon, I used these ones:
https://www.amazon.co.uk/gp/product/B011LY0LTS/
These will press-fit, however you may want to secure them better with a little glue.
The author hasn't provided the model origin yet.