Cartesian Diving Bell Toy

thingiverse

Cartesian Diver Toy This is a simple Cartesian Diving Bell toy consisting of three parts; - A cylindrical body with flood holes for the base - A cap with vent hole - A flexible bulb The first two parts are printed and the third part is made from a 3ml pipette readily available from a drugstore or online (I bought 100 pieces from Amazon.de for a few Euros). That’s enough to make an awful lot of Cartesian Divers. Print the two parts and then insert the pipette bulb into the body as far as it will go. Using a sharp knife, cut the stem flush with the base of the body. Remove the bulb, press the opening over the stub in the cap and glue in place. When the glue is dry, push the glued assembly back into the body and glue the cap and body together. Make sure the glue is completely dry before proceeding to the next step. To calibrate the diver buoyancy, submerge it completely in a bowl of water with the cap facing up. Shake it around to make sure the base cavity is completely flooded. Next, start to fill the bulb with water by squeezing it in a series of steps. After each step, check to see if the diver still floats. Stop when the diver just floats with most of the body under water and the top just breaks the surface. If it sinks, pull the diver out, expel some of the water in the bulb and try again. When the buoyancy is just right, drop the driver into a completely full plastic bottle or a glass bottle with a flexible lid. Make sure there is no air in the bottle when you close the top. The diver will now sink when you squeeze the plastic bottle or push down on the lid of the glass bottle. It rises again when you release the pressure.