Note for people planning unconventional mouting of the MMU2

Peter L

(@peter-l)

Honorable Member

Note for people planning unconventional mouting of the MMU2

I seem to recall a few questions about whether it would be possible to mount the MMU2 in some place other than on the top of the printer (i.e. outside an enclosure).

Reading through the MMU2 assembly manual, I noticed that the filament sensor in the MMU2 relies on a ball bearing that drops into a little space when there's no filament present. This means that the MMU2 has a definite "this end up" and won't work if you try to mount it in some other orientation (upside down, sideways, etc.).

It also means the MMU2 won't work in zero-G. Just in case anyone was wondering.

Postato : 30/08/2018 9:54 pm

Paul Meyer

(@paul-meyer)

Honorable Member

Re: Note for people planning unconventional mouting of the MMU2

Darn it! They should have let us know that up front! What was Prusa thinking, silently dropping support for zero-g? I work for NASA and we ordered an MMU2 to upgrade the printer on the ISS. Now that is out the window. Their mission critical tools and space station bits will have to continue being boring single color prints. Think of the morale impact! Plus NASA is out $300! Congress is going to be mad.

Postato : 31/08/2018 12:03 am

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Dewey79

(@dewey79)

Honorable Member

Re: Note for people planning unconventional mouting of the MMU2

Reading through the MMU2 assembly manual, I noticed that the filament sensor in the MMU2 relies on a ball bearing that drops into a little space when there's no filament present. This means that the MMU2 has a definite "this end up" and won't work if you try to mount it in some other orientation (upside down, sideways, etc.).

I just finished watching the two new videos released and I see what you're talking about. I was thinking we could still dismount the unit from the printer frame and attach it to a frame just above the printer.
As far as not being able to rotate it because of gravity, I think a loose fitting spring that would allow the PINDA probe to see down the center to the ball would work.
The spring could interfere with the probe even though it's not directly in the path though.

Postato : 31/08/2018 1:54 am

Kabammi

(@kabammi)

Utenti

Re: Note for people planning unconventional mouting of the MMU2

i've got an idea. a jet of compressed air would provide enough force. So just a small air pump would do the trick. If NASA is paying... 😎

Postato : 31/08/2018 11:38 am

PJR

(@pjr)

Antient Member Moderator

Re: Note for people planning unconventional mouting of the MMU2

A few words of advice. Don't plan anything until you have the MMU2 working in stock condition.

Peter

Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…