Magnetic Concentrator For 96-Well Plates

I wanted a reasonably priced magnetic concentrator rack for my lab, so I designed this one. It has several advantages over the commercially produced concentrators, including the small divots which help keep the plate in place. Note: this product needs magnets to work properly. I use the K&J magnetics 1/4" diameter x 5/8" thick N52 magnets (https://www.kjmagnetics.com/proddetail.asp?prod=D48-N52) with a press fit. 

Note: you may need a dab of glue to get the magnets to stay in place.  I haven't on all but one of my samples, but sometimes tolerances vary.