The evolution of a whistle, and a basket I made for a fish tank

thingiverse

Whistle 4 is the functioning whistle in your setup; it can be disassembled by inserting a paperclip through the ball print for removal. Designing and testing this whistle showcased the benefits of desktop 3D printing, completed within an efficient afternoon session. Meanwhile, the fish tank filter prevents fish movement between tanks, equipped with two hoses. However, you altered your plans and no longer use it in that particular tank.