Steel ball does not fall  

Re: Steel ball does not fall

Most likely a small string under the ball. You should take out the FINDA and ball and clean out the chamber. {But don't lose the ball!}

Peter

Re: Steel ball does not fall

BTW, I find drill bits (usually without the drill) to be an effective way of cleaning out holes like this. Pick a smaller diameter drill bit and you can move it around using it to scrape the walls of the hole of any protrusions.

Re: Steel ball does not fall

I think it is due to stringing too though I found nothing . The ball can be easily dislodged by a segment of filament. Thanks guy

Re: Steel ball does not fall

Yes seem to happen all the time...

Re: Steel ball does not fall

Another cause is that the MMU is tilted at an angle. So gravity does not work fully to pull down the ball.

Re: Steel ball does not fall

why did I hear Duke Nukem say the subject line?

Re: Steel ball does not fall

Experienced the same issue. Because of this the tool change was stuck.
After slight "knocking" with screw driver beside the MMU-Pinda the ball was fallend down and tool change was proceeding.
Unfortunately the issue happend again, again and again and so i needed to stop the dual color print.
Issue happened after about 10h MMU print.

Re: Steel ball does not fall

After working trying to find a way to get a successful print I have found that the FINDA ball not falling and getting hung up on a small string or a piece of filament is my number 1 cause of why the print stops and does not continue. I worked a lot with the ramming parameters and have been able to achieve a pretty consistent tip but there still is that 1 out of 20 changes that strings a little and then causes the problems. I have worked out all of my other issues but have not figured out how to fix this one. I really do think the filament sensor ideas from the laser sensor to the PINDA sensor are really good ideas but still need work. I hope someone someday will come up with a reliable way to sense the filament that is not completely dependent on scenarios that absolutely have to be met before it works. The laser sensor is getting better with different colors but I don't think this will ever be able to do what is required from the FINDA in the MMU2. The lazer will still be tripped by strings and clutter. In the end being able to make a completely clean tip would solve this but there are so many variables in this that I don't think this will ever happen for every type of filament.

Re: Steel ball does not fall

drop the filament temperatures lets say 2C at a time across the board.
or if you keep finding the same filament color in the FINDA then just drop that filaments temperature

for me yellow kept clogging i dropped the temp 5C on it only.