We're using these for stacking lickimats in the freezer before giving our dog a yummy frozen snack.
Sized for 7.87" x 7.87" x 0.28" lickimats available at your local pet supply store :) print a peg for each corner to stack them. If tolerance is too low, scale down a bit and reprint.
Printed in clear PETG (note that gcode files use a 0.6mm nozzle) for that “ice” look (and to match Kong holders I printed previously). There was a lot of stringing, as expected, but I cleaned it up by hand and with a little fire.
2021/12/13 - added longer pegs for higher clearance
The author hasn't provided the model origin yet.