Holds 1.7 ml Ependorf-style tubes up against 1/2" magnets. For use with any kind of magnetic beads. It works well, the tubes snap into place with the divots and the conical part becomes flush to the magnet.

Of the two I made out of PLA a year ago one has become slightly deformed and the tubes don't stay snapped into place very well. The other is perfect. Ill be moving the magnets to a PETg one and if I don't update you assume this one is still working.