Pollen Press (Use with a US Penny)
thingiverse
Take the core, that little sphere with the rod protruding from the top, and position it snugly inside the tubing. Next, grasp the top section and insert it securely into the open end of the tube. To firmly join the components together, apply gentle pressure using a United States penny; note that its central hole measures 20 millimeters in diameter.
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