Spec for MMU2 springs?
What are the specs for the springs? They tend (for me) to pop off the screws when opening the MMU2 to clear filament, and I've managed to lose one. I know I could get Prusa to send me one, but it seems overkill to ship a tiny spring internationally. Researching springs, they don't seem to come in standard sizes, but is there some way to locally source a spring for the MMU2?
RE: Spec for MMU2 springs?
did you ever figure this out? I'm in the same boat.
RE: Spec for MMU2 springs?
Well, just try what you find at home or local store. It must only fit to the bolt and be long enough to be able to adjust the force. Tip: For hard filaments a spring from pen doesn´t work, you will need stronger one.
I had a different spring issue with printing softer filaments like flexible fil or PP and I had fixed it with softer spring from a pen.
RE: Spec for MMU2 springs?
On a related note, I would strongly recommend printing and installing those thumbscrew extensions, available in the Prints section, and barely visible in the photo below.
These make opening the unit MUCH easier and reduces the chance of springs and bolts flying across the room.
You will need slightly longer bolts, available from about anywhere, to make these work.
RE: Spec for MMU2 springs?
I use springs specifications like this: (not Prusa original):
innerdia.: 3.3mm
outerdia.: 4.9mm
spring steel 0.8mm
length: 15mm
allen screw length: 30-35mm
I unfortunately only know German sources or Prusa, but maybe you can find a spring store in your area.
wbr,
Karl
Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen.