I have been on a hunt for the past several years to find a cheap and simple, yet moderately high resolution 3D printer. I had 3 different 3D printers partially constructed when I heard about the amazing technology of DLP Stereo lithography (SLA) printers. I have finally found enough parts at the right price to construct a fully functional printer capable of amazing quality with spending less than $100. Top down DLP printers in their simplest form have only one axis of motion, a video projector, and minimal electronics. They do not require a heated or perfectly level bed, there is never a clogged or wrong temperature in the extruder as it does not use an extruder. And the resin used has a comparable price to FDM printers.
I Started this project to show that you don't need a lot of money or special equipment to start experimenting with 3D Printing. While this printer was not meant to give the same quality as an expensive printer such as the form 1, the results I got exceeded my expectations. There are still a few bugs to work out but, it definitely is usable. If you would like to see a video of it printing, the video is in Step 12.
The chimera (ky-meer-a) is a mythological creature that is made up of 3 different animals, this printer is made using the recycled/modified parts of 3 different categories (projector, toys, and old computer stuff), hence the name.
I am always looking for constructive criticism, let me know of any ways I can improve on the project, or the instructable!
Before continuing I would like to apologize for the not-up-to-current-standards pictures and video quality, I am working with almost or over a decade old equipment in bad lighting. I will try to update the photos once I get a better quality camera and/or find a better location for pictures.
Update 7/14/15 This project won one of the enthusiast grand prizes in the 2015 3D printing contest. Thank you everyone for their votes, and thank you instructables for continuing to be the best online DIY community! I am glad I could contribute to this site and hope my next project will spark as much interest as this one did.
Let’s start out with the basics, in 1986 Charles W. Hull created stereo-lithography as a form of fabrication that uses ultraviolet light to cure a polymer resin to create solid objects. Since then, projection technology has opened up a highly accurate, fairly cheap, and easily accessible form of ultraviolet emission. A DLP printer is different from the "normal" FDM (fused deposition molding) 3d printers that have been dominating the community, an FDM machine uses an extrusion system similar to an advanced hot glue gun that is attached to an apparatus that can move the extruder in an X, Y, and Z direction. The extruder must follow a path made by a computer to print objects. A DLP printer uses the stationary projector to display the entire X and Y portions at once onto a resin that turn from a solid into a liquid from the light emitted by the projector in the shape of the projected image, and uses one axis for the Z motion.
Top Down vs. bottom up
Even though bottom up printers are capable of printing larger and higher quality objects with less resin, I decided to build a Top down printer for its simplicity and ease of construction.