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Jumping UM3

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Posted · Jumping UM3

GR5,

My printer will not do any more diving soon unless it can jump up 1 inch and over retaining 4 boards,

 

I myself do not understand how this can happen, no one was here at the time.  The printer does not move that fast to make it jump or slide.

The only think I can think of  if something got stuck and there was hard movements,, which I do not see happening.

 

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Posted · Jumping UM3

I noticed that your tables do have wheels, and the frames are rather thin. Usually such tables are not as stable as fixed tables, at least not the ones I have seen here. So, do they wiggle when you touch them or hit them, or are they rock-solid?

 

If they wiggle, maybe they came into resonance while printing a specific part of the model, and this resonance was just enough to make the printer move?

 

If Nicola Tesla could destroy a whole building with a little device as big as a cigar box, due to resonance, then I could imagine resonance can make a printer move too? Also you might google in Youtube for films of the Tacoma bridge coming into resonance, swinging meters up and down like rubber, and finally collapsing after an hour or so. In only moderate winds.

 

Anyway, be sure to put a rubber anti-slip mat under it. The ones that have a very sticky feel should work well, and they reduce sound as an added benefit. If I were in your place, I would also glue or screw a little border around the table, so nothing can roll off or slide off.

 

We do not disbelieve you, but in problem solving, when we try to comprehend what happened, we look at the most logical reasons first. And kids or pets throwing something off a table are way more likely than a printer walking around due to resonance (or whatever else). So we need to eliminate the logical causes first. That is all. Don't take it personally, it's just technical.  :)

 

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Posted · Jumping UM3

So as soon as you get an identical printer at that very same place, please load this deadly gCode, install a webcam and post us a video! :sunglass:

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Posted · Jumping UM3

Did you guys ever figure this out? It happened to the UM3+ at our office this weekend - we came in and the printer was face down on the floor struggling to finish a print. We are completely mystified as to what happened to it as we've had it for over a year on the same type of table with no crazy problems.

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Posted · Jumping UM3

Charlies,

No I never found out what happened,  still puzzled even now that an UM3 took a dive.

I hope yours is still working after the dive off the table.

 

Frank

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Posted · Jumping UM3

No, ours has very much ruined its print head with this fall. I am intrigued as our printer managed a very similar faceplant to yours, with the material spool holder at an angle and one flying off. We also had a buildup of PLA surrounding the cores, but not quite as extreme as yours. I'm running through possible scenarios but can't seem to come up with anything plausible - unless something went terribly terribly wrong with the print and caused the machine to "vibrate" its way off the table.

printer down.jpg

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Posted · Jumping UM3

Or resonance due to a particular model geometry? Or due to the nozzle banging into curled-up overhangs, or into a half-detached print, or so? Were the models still stuck to the glass? Or had they come off (maybe you can see if they came off before the jump, by analysing any spaghetti)?

 

If you can get it to work again, try the same model again, but now stay around?

 

Anyway, it seems like a good idea to glue or screw an edge to the tables. Or maybe put rubber antislip/antivibration feet or mats under it?

 

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Posted · Jumping UM3

Resonance -or vibrations in general-, possibly caused by the layout of the print, may be able to move the printer in "Y-direction", because it sits on its side-panels, on four nearly skid-shaped surfaces.  And traveling over the edge of the table, gravity will do the rest...

I had an eye on possible vibration-related movement of the printer (UM3) since first use (about 1 1/2 years ago), but since i made a set of these:

www.thingiverse.com/thing:3059433

from TPU, there is -till now- no movement of the printer at all - and a lot less vibration.

 

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