Prusa I3 - Hot end pushing heated bed when print start. (2 replies)

Hello everyone,

I am having a problem here which I definitely don't understand.

When I start a print the below code is run:

G28 - no problem
G29 - no problem

Then the hot end moves to the correct X/Y position and Z goes down and down and down... until it touch and push the bed down :S. Usually at that time I kill everything.

I have a capacitive sensor which acts as end stop and it seems to be working because the G28 and G29 works perfectly well !

I am completely lost...

Does someone have an idea ?

Thanks