This is a collar that lets you insert a 0.2 mL PCR tube into a 1.5 mL tube. A set of 24 pieces prints in about 1.5 hours (60 mm/s, 0.40 mm nozzle).
The collar's low profile lets me fit PCR tubes into machines like tissue lysers — extremely convenient grinder-to-thermocycler workflow! You can also centrifuge PCR tubes in a larger machine now.
You should test your own tubes and prints to make sure that they can withstand centrifugation at the forces, periods, and temperatures you need, before you risk samples. This collar cannot help you if you use weak, low-quality tubes!
The collars are a secure press-fit into 1.5 mL tubes that have an inner diameter of 9.00 mm. Cut the lids off your 1.5 mL tubes to make them easier to handle.
If the fit of your smaller tubes is too tight, you can expand the openings using a knife-edge reamer tool.
Jun 15 2016: Initial release.
Apr 18 2017: Replaced the design with a new one that uses less material, prints faster, and fits inside a 1.5 mL centrifuge tube. A friend of mine had the old design delaminate along the print layers while she was centrifuging something. By relying on the support of the 1.5 mL tube, I hope to prevent this from happening to anyone else.
May 7 2017: Tapered the top of the adapter into a flat dome. This makes it easier to uncap and remove tubes.