15 to 50 ml tube rotator converter

thingiverse

These adapters allow you to use a standard 15 ml conical centrifuge tube rotator, such as the #60448 model, to rotate 50 ml tubes too. Simply attach the adapter to the tube and then click the back of the adapter into place as if it were a 15 ml tube. For most simple rotator applications, v4 is probably the best option available; it uses less plastic than other models and features a slightly wider internal diameter that makes it easier to insert tubes. V1 and V2 are still included for users who need a very tight hold on their tubes.