On Feb 18, 11:18*am, erik wrote:
im curious how rubber prebent hoses are made.

They used to be made by extruding.The outside die plate could be moved
off centre which meant a thicker wall on one side of the tube.
The other side being thinner extruded at a faster speed and therefore
caused the hose to bend.A simple plc programm to control the die along
with a face knife and off you went.
That technology is over twenty years old so they may have moved on.