[DIYbio] diy magnetic plate for DNA purification?

Has anyone considered building an 8-well or 96-well magnetic plate for
purification of DNA with magnetic beads? I was looking at the prices
of plates and they're pretty expensive. It seems to me that they're
just a 96 well stand with neodymium magnets placed in between. A 100
neodymium magnets placed between a used pipette rack seems like it
could do the same job and cost 10x less.

Thoughts? What about the magnets and their strengths?

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