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This model can be printed in flexible TPU material and have small magnets embedded into the end. A great tool to help your students (or you) to think about supercoiling! Also known as DNA-420bp-magnet-supercoil. More info including a complete interactive activity can be found on rostonlab.com!
To print flexibly: Download the file and upload it to Shapeways as your own model. Then purchase in TPU!