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96 well plate / 0.2 mL strip tube Magnet Rack

by acadey, published

96 well plate / 0.2 mL strip tube Magnet Rack by acadey Apr 24, 2013

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This is a magnet holder for magnetic bead separation for either a 96 well plate - or a 96 well plate with the wells cut out can be taped on top to hold 8 tube strips. The magnets for this new version must be custom ordered (KJ magnets) but it is well worth it for the improved performance. Now beads are pulled up and to the side making it much easier to pipette out the contents without disturbing the beads. The magnet specs are:

Custom NdFeB Block Magnet, Part No. 4C3M04
2.750" x 0.188" x 0.188" thick
Grade N42, Nickel (Ni-Cu-Ni) Plated, magnetized through 0.188 in thickness
Qty 24 @ $6.35 each (minimum order quantity)

I am not sure if that order number will stay in the system though. The minimum order makes 4 magnet racks, so if you need less - team up with another group. For tube racks just cut the top rings off of a 96-well plate and tape it to magnet rack (shown in photos).

NOTE: The first version uses available magnets (http://www.kjmagnetics.com/proddetail.asp?prod=BZ082), not custom order, but pulls beads to the bottom, not the side. The new version (303) performs much better and is recommended.

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New version - it requires custom order magnets but it is well worth it. This version pulls beads up and to the side and also has struts that make it easy to glue in the magnets (I used superglue and it worked well).

Added a new version for smaller, square magnets that may help pull beads higher up on the tube wall. Still in development, so any feedback is appreciated. I will hopefully have some results soon, but it is jammed into the middle of a long to-do list...

Hi, I am looking into building this rack but I can not find the file with the top part that has the holes. Am I doing something wrong?

There actually is no top part. It is designed to hold entire 96-well plates. If you want the top part with the holes, the best way is to take a skirted 96-well plate (where there is a hard shell and the tubes are of different, clear plastic - I have a link to an image below) and just cut the tubes out by running a razor over the top (carefully - its easy to cut yourself since the blade can get stuck).

Image: http://ecx.images-amazon.com/images/I/41C7%2BO3kXCL._SL500_AA300_.jpghttp://ecx.images-amazon.com/i...

Thank you !!!

Has there been another version made with different magnets?

acadey - in reply to 1234

I have one designed, but have not yet had the time to print and test it. Hopefully int he next month though.

This is amazing work!