ERKS is abandoned at this point, I'm afraid...or...it's still a Work In Progress...though it said that over 3 years ago now.

https://github.com/EtteGit/EnragedRabbitProject

https://www.prusaprinters.org/prints/4809-ez-load-plate-for-prusa-mmu2s-buffer

Looks great and a bit familiar if I might say. Not meant in a negative way, just found all the good things combined. Anyway, I had some questions regarding your product, but your mail address isn't working. Could you come back to me?

Michael

I have been looking the the Filament Buffer Mod and have not seen anything interesting yet for a filament buffer upgrade to make it easier to load.  Anyone see anything that improves the loading of filament?

Thanks

YES! I am developing one. It fits to the printer on the back corner. Its compact and does not extend over the back and adds just 40mm to the overall width. You can even load it while its in use!

There were two things I had to do to make it work perfectly.

First, this is what was going wrong.

When the filament was being used, it pulls the arm up with the bearing weight on it.  Using the parts from the spool holders.  

I went with the 120mm wide base and cylinder and when I had thinner spools on, they would be all the way to one side which caused filament to loop over the cylinder and end up getting caught up.

Two things I did to fix it perfectly.

First, printed out another five of the nuts that you use to tighten up the spool.  This way, I could use one on either side and adjust where the filament was positioned on the cylinder.  That kept the path straight.

Then I noticed that the spool at times wasn't fast enough to gather in all the slack. Again, causing it to loop over and off the filament spool.  I had extra bearings and pushed 2 in the slot at the end of the arm that usually holds one.  That extra bit of weight made all the difference.

Now, no issues at all.

I can't recommend this solution enough.  Yes, lots of parts to print, but overall, with a couple of printers working and using his suggested print settings, I had 5 made by the end of a weekend.

Thanks for your links @cybrsage, I really need to get something better to load filament in the buffer, very painful. I'll give the tool a try.

I have a collection of MMU2 thingiverse upgrades, slowly removing things I am not going to use.  I want my entire path to be as airtight as I can have it (using water soluble supports), so I am using a rewind spool holder that uses gravity assist to rewind.  Works well.

https://www.thingiverse.com/cybrsage/collections/mmu2-mods

Thanks for your links @cybrsage, I really need to get something better to load filament in the buffer, very painful. I'll give the tool a try.

Look into the PTFE passthrough mod for the buffer too. It lets you move all entries and exits to one side and it gives you more space to grab and manipulate the filament. The combinate of that mod and the tool make loading a breeze.