Ceramic Shell in Suspension for lost-wax & lost-PLA metal casting. 3d Printers for Pottery & Concrete.                                                                                                                                                                                                                                                                                                                                      Shellspen means "Shell" for ceramic shell, in "Spen" in suspension. Developed in the mid 1960's in Sarasota, Florida's first art foundry and sold Worldwide since 1979.