How to refill the cartridges?

Hello,

can someone please explain to me how we can refill the cartridges?
And, can we use all PLA for it? Or de we need a special brand?

Is there an instruction vid for it?

Thanks!

Best regards,

René

One of the oldest questions and I won’t go into details how to actually refill the cartridges.
Please drop the cartridge and double motor drive system. It causes more trouble than gain.
Have a look on thingiverse for Zim or Zeepro related things and you can find several nice additions to your Zim.
One of those is a rear spool holder to use only the top filament drive with a shortened PTFE tube.
Thats the only good way to go.