A DLP 3D printer works by shining light into a vat of photosensitive polymer using a Digital Light Processing projector, curing a thin layer of the goo until a solid part has been built up.

We suppose [Dan Beaven] got up one day and said, “I’ll make my own resin 3D ... the printer can run unattended. In the resin handling area of the printer he’s also added a carbon air ...