These are experimental isolators that I created that utilize neodymium magnets to hold together. They will hold the couplers together while printing but release in the case of a bed crash. The magnets are 1/4" diameter by 3/8" length and should simply press in place. Link to video: https://www.youtube.com/watch?v=ag9MiQwUcZs Edit 9/9/15: I have added a v2 that I think works better for eliminating Z axis wobble. Still utilize the same magnets as before.Print all 4 parts. Any resolution, 3-4 shells and 20% infill is what I would recommend. Press in the magnets. Mine pressed in nicely; gently heating them with a soldering iron may help. Install and print.