3D Printed Magnetic Couplings

I would agree with Chris, I did try to make a set, but mine had a swivel movement in the horizontal plane to allow for slopes. Generally they would work but they were a bit bulky in the first prototype. I then got distracted onto something else and the project got shelved, one day I may re-visit if people are interested, especially as I recently sourced some really powerful, but small neodium magnets at a good price which would be ideal as they are really strong...