as i am too cheap to buy a proper Lightblaster, I decided to modify the work of others. this is a work in progress. it is designed to print at 100% and fit any Canon fit lenses, and will accommodate a Yungnuo 56x series Flash. It has an integrated Manfrotto 200 type tripod mount, and is balanced so that a canon 24-105 lens and a Yongnuo 560 flash work well together. simply attach the lens to one side, fit the flash in the other, point it at your target (focus the lens properly), and fit a slide in the middle (you can use the slides provided, or design your own - one of them is designed to take a standard 35mm photographic slide for more effects). when the flash fires, the image from the middle will be displayed.
it will require supports, and i always print with a raft. there is some cleanup of the inside required, this is fairly easy, but does depend on your specific print settings.