My puppy eats his food way too fast. They didn't have the right sized insert at the store, so I made my own. I made one with a cutout in the middle to insert a suction cup that I had lying around. The other file (dog_bowl_no_cutout) is just flat along the bottom if you would like to secure it to the bottom of the bowl with tape or something else. I've included my OpenSCAD file if you want to change any of the measurements. The STLs I've uploaded are 110mm in diameter, with the outer cones measuring 53mm tall and the inner cone measuring 33mm tall. Marked as work in progress because I haven't finished printing the model with the cutout for the suction cup. I might also try to clean up the OpenSCAD file to make it easier to customize.