Magnetic holder for 15- and 50-ml tubes

thingiverse

My initial idea was to design a magnetic holder for 15- and 50-ml tubes so they can be attached to the rotator. Therefore the hold is pretty tight. I made the inner diameter of 28 mm for 50 ml & 15.6 mm for 15 ml. Magnets are inserted inside (round:10 x 3mm) by pausing the print. There is a version of a file without the magnet. I like to have 3 perimeters, but 2 work also well. No support, infill of 5% is enough.