Citrus fruit coasters. These are printed with transparent pla around the rind and seeds. In the model use transparent filament when printing in place of the white to make the rind and seeds show up.  The slice will show up all white there.  For the rinds and seeds I used a cream color, but you can use white. Also print with 26 bottom shell layers so that there will be no infill.  After printing we added 4" self adhesive cork backing easily found on Amazon.