SummaryThis is a redo. The arms are coming from the side. This allows side preasure. So far there working even better than version 2. This uses a magnet stack on either side, one round magnet, and one concave magnet. In addition, there's a spring for adding return preasure for the included switch, taht acts as a z probe. I've also used a angel eye, round led, to make sure I can see the printing in my study.