The Thingiverse Ruby SDK by Tony Buser allows to upload files via API interaction. This way, developers can design 3D models for future printing purposes. Resources include installation and Ruby gem usage.
Mimeo.com just launched a new area to support its family of APIs, print marketplaces and enterprise print integration tools. Developers can build applications that offer print-on-demand services, using the Mimeo Connect Cloud Print API. Mimeo.com has long had a SOAP API, but has recently built an easier-to-use RESTful API for developers.