Oh! Oh well, thanks for clarifying, I thought one needed to set the recipe by signaling the recipe. Thank you for the quick response though!

When I enable 'set recipe' in the crusher, it sets the recipes I send thrhough the network, until there is no signal anymore, then it sets metallic asteroid crushing all by itself unprompted. I expected the crusher to set no recipe instead. This does not happen when there was no other recipe set ...