A centrifuge hub designed to hold four 2.5 mL Eppendorf tubes. Tested up to 10,000 RPM1) Laser cut one center hub and four petals 2) Tap the small holes on the petals with a M3 thread 3) Screw together with 4 M3 screws (15-20 mm long) If you are making one for a dremelfuge, make sure the center hole diameter matches the shaft diameter on your device.