end stop switch?

Sorry if i have open 2 tread, admin  can delete my previous one if need

I have problem wih strange rumors, and block of extruder

what can be? end stop switch?

i share my video and picture of the problem

https://drive.google.com/open?id=0B5Am_ftKJ8Ohd04yWV9Db2VVR1E

https://drive.google.com/open?id=0B5Am_ftKJ8OhUVBlTEV5TkZxeEE

https://drive.google.com/open?id=0B5Am_ftKJ8OhZEdKdTNuOTVBd0E

https://drive.google.com/open?id=0B5Am_ftKJ8OheEdXdWFKN1AyMXM

That doesn't seem like its the end stop switch. It seems like it would be the pulley stepper motor on that axis, being as it doesn't get to the edge of the machine before it stops and makes noise.

That doesn't seem like its the end stop switch. It seems like it would be the pulley stepper motor on that axis, being as it doesn't get to the edge of the machine before it stops and makes noise.

mmmmmmmmmmmmmmmm it can be

solved!

the problem was the too much tight bolts in the axis support.....

probably when i  tight too much that screws the extruder dont run much free and engine loose the belt teeths