Wind-up Swimming Fish

Update 1 - 06.06.2025There were some painting errors in the print profile that could cause the print to fail. I fixed it.Update 2 - 08.06.2025I added a new way of printing a fish tail. I cut it almost in half. After printing, you will receive two parts to glue together with super glue. This way it is easier to remove the supports and the quality of the tail is better. I tested it and the tail performance is very good.Update 3 - 03.07.2025I tested Basic Rubber Bands from Maker's Supply . I printed fresh fish and use 3 pieces 1.4x60 mm. Mechanism worked very well. OverviewWind-up swimming fish - a great companion for bathing in the bathtub and pool.This project was a bit of a challenge.I had to turn the rotation into a flapping tail fin.At first, I designed this mechanism with a bendable wire and after a few attempts it even worked.However, bending the wires was too difficult and time-consuming. I had to try with filament and surprisingly after a few more attempts the mechanism start