How much force should it take to move filament through the mmu2s?
I've noticed that it takes a considerable amount of force to pull/push filament through the entire system (from the buffer all the way to the extruder). Of course I expect there to be some friction with the amount of Bowden tubes, but I feel like the friction I'm feeling is enough to be a leading cause of errors.
It's a vague question, but how much force does it take for you to pull filament through?
Re: How much force should it take to move filament through the mmu2s?
One of the good pieces of advice I saw was to replace the long lengths of tubing with 2.0 ID tubing. Since doing that, the resistance is minimal.
Re: How much force should it take to move filament through the mmu2s?
One of the good pieces of advice I saw was to replace the long lengths of tubing with 2.0 ID tubing. Since doing that, the resistance is minimal.
Good idea. It does seem like the bulk of the friction comes from those tubes. Any particular type of tubing you suggest? And how did you go about attaching the tubes?
Re: How much force should it take to move filament through the mmu2s?
I replaced the long lengths with 2.5mm internal diameter tubing.
and modified the roll holders with larger rollers to reduce the resistance.
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
Re: How much force should it take to move filament through the mmu2s?
One of the good pieces of advice I saw was to replace the long lengths of tubing with 2.0 ID tubing. Since doing that, the resistance is minimal.
Good idea. It does seem like the bulk of the friction comes from those tubes. Any particular type of tubing you suggest? And how did you go about attaching the tubes?
I bought this (it's 2.5 not 2.0mm ID): https://www.ebay.co.uk/itm/121056068011 . It's the same outside diameter, so fixing it is the same as the supplied product. I actually put push through connectors on the back of the MMU2 so I didn't have to have to have them all hanging off the back if I don't have all 5 pipes loaded.
Re: How much force should it take to move filament through the mmu2s?
I noticed the same thing (tight resistance from the reels to the MMU) and recently replaced all the tubing from with the 2.0 Capricorn tubing (4 meters worth). My first two tests and had filament get crossed over on the roll causing a massive jam that I need to disassemble the extruder and a second jam (most likely filament issue).
Once I get a few posts under my belt I will report back.
My BC (before capricorn) prints had missing layers and I attribute that to the quality of the filament binding in the tubing.