I made this design for a friend of mine who loves bears! I've provided recesses in 6 coasters to hold drinks up to 85mm in diameter. The whole thing is held together with magnets that have to be inserted during printing into the pockets provided. Use your slicer to add a pause just before each pocket gets closed so that the magnet can be tucked inside. It's designed for 8 x 3.5mm magnets using 2 magnets stacked in each pocket on the coasters and single magnets in the head for a total of 77 magnets needed.

Obviously what heat this can take will depend on what filament you print it in so be careful with hot drinks, especially if you use PLA!