Slow feeder

Good for cats or small dogs, this forces them to eat slower while providing stimulation and enrichment. Eating too rapidly can cause some cats and/or dogs to vomit or lead to other digestive issues. It also helps when feeding multiple animals at once, preventing the fastest eater from emptying the bowl before the others can eat any. 

(We don't free-feed our cats or dogs, but at meal time, our fattest cat will inhale the entire bowl before the other cats get a bite, so this helps prevent him from ballooning any further and prevents the other cats from starving)

If your cat and/or dog frequently chews things, print and use this at your own risk. I haven't the faintest idea how healthy consuming PLA/PETG/ASA/etc is for small animals. 

Easy print, no special settings required.