Thử nghiệm van bóng bay (có thể tùy chỉnh)

A test what you can do with a balloon and 3D-Printing :-)
First a valve to inflate the balloon so that the air doesn't come out that far as it goes in.
The ball I used is magnetic so you can get it off the valve end with another magnet.
You have to insert a pause in the gcode (easy with prusaslicer) when the diameter of the hollow space is max.

I heated up the ball a  bit, so it fits better as a valve…

And you may want to put a little nailpolish on the thing…

Have fun with the OpenSCAD-Code... Maybe with a whistle in it as a next try.