PLA Zoo biscuit PLA Brooch / Badge. Our ZOO BISCUIT Brooch/ badge is too cute for words . This is a great gift for any South African. We love ZOO BISCUITS & this will definitely bring a smile to many faces.Dimensions (30mm x 21mm x 8mm). They are 3D printed at home using Polylactic acid, also known as PLA. This is a thermoplastic monomer derived from renewable, organic sources such as corn starch or sugar cane.