42 Computer aided design services; Engineering services, namely, engineering design services, design engineering optimization, design manufacturability checks, design quality control, and overall manufacturing and production planning; providing online non-downloadable software for design validation, customization, printing, ordering, delivering and enabling the printing and manufacturing of prototypes, spare-parts, tooling, missing parts and other products; software as a service (SAAS) services featuring software for design validation, customization, printing, ordering, delivering and enabling the printing and manufacturing of prototypes, spare parts, tooling, missing parts and other products; providing online non-downloadable software that enables customers to upload CAD (computer aided design) files in order to receive manufacturability checks, design recommendations, price quotes and lead times for the production of CAD designs for specific technologies and materials