I'm trying to design some incredibly cheap replacement galvos that could be used in any SLA printer for under $15/galvo using parts people probably either already have or can buy from Ebay. My initial results are hopefully attached.
The mirror (its back visible in picture with coil and magnet attached) was later mounted to the dental floss. The frame is the bottom of a dish detergent bottle. The floss was tightened by a combination of the natural flex of the frame and by twisting a toothpick which was secured in place by friction with a solvent welded abs hook from a failed print of comet 67p (in white on top). The mirror was mounted by friction to the floss by sandwiching the floss between the two little neodymium magnets. Unfortunately the coil on the back of the mirror didn't provide enough/any damping so the assembly is useless despite being able to get a good range of angles precisely with under 5 volts. I suspect this is because for eddy currents to properly form it must be a closed loop and the wire on the back currently is not a closed loop. I might try using a piece of copper foil instead as that's thicker than aluminium foil/nashua tape I also added and would make it easy to cover the entire surface area. I think that even that won't be enough though so I'm going to next try mounting the mirror rigidly to a stainless steel needle mounted between two broken glass christmas tree light tips. (extremely low friction and cheap) From there I can introduce damping by simply adding some tiny rigid flaps elsewhere on the the needle that can use wind resistance to break similar to how the inside of a music box regulates its rotary speed.
https://s11.postimg.io/fn0wcgixv/IMG_0489.jpg
Other approaches I might try are on this page: http://spt06.chez-alice.fr/00/scan1.htm
