3D printing is when 3D solid objects are made from a model on a computer. 3D printing is done by building up the object layer by layer.
3D printing is usually done with a materials printer. Since 2003, many more materials printers have been sold than before. Also, the cost of 3D printers has gone down.
SPEECH - GENERATING DEVICE
Speech-generating devices (SGDs), also known as voice output communication aids, are electronic augmentative and alternative communication (AAC) systems used to supplement or replace speech or writing for individuals with severe speech impairments, enabling them to verbally communicate their needs. SGDs are important for people who have limited means of interacting verbally, as they allow individuals to become active participants in communication interactions.
Microforms are any forms, either films or paper, containing micro reproductions of documents for transmission, storage, reading, and printing. Microform images are commonly reduced to about one twenty-fifth of the original document size. For special purposes, greater optical reductions may be used.
All microform images may be provided as positives or negatives, more often the latter.
Three formats are common: microfilm (reels), aperture cards and microfiche (flat sheets). Micro cards, a format no longer produced, were similar to microfiche, but printed on cardboard rather than photographic film.