What is the decoupler?

[Programify 3]

Please does anyone know what the decoupler is and what it looks like?

 

https://support.ultimaker.com/hc/en-us/articles/360012325219

mentions it but didn't make it clear what it is only that it might by on the back of the printer.

[gr5 2,094]

It's those long skinny rectangular boxes - one of which is just above the person's hand.  It's very fancy and keeps track if the feeder in the MS is running slightly too fast or too slow than the feeder higher up on the printer itself.  The MS then adjust the speed slightly in the MS so it doesn't get too far ahead or behind the feeder on the printer.

[gr5 2,094]

Note that if you don't have a Material station (MS) then you don't have the decouplers.

[Programify 3]

Thanks for the reply gr5. The photos in the ER52 notes only showed the filament motor drive mechanism. I thought that might be called the decoupler for some reason.