After working on the VVD for several years, I found during an Internet search that this company, Voxon (they are based in Australia) has made a very similar device. There are some differences, however, in the motion system used on the VVD with the oscillating motors (that is not perfect, as you have to change the rubber bands after a ful day ;) ), and in general, their device is much more refined!

The VVD is a protoype, and I have designed everything by myself, including all the Cad design, electronic design, writing of software and firmware, documenting with photos and pictures, and (trying to) promote it; in this task I kinda failed, since it never became a commercial product! ;)