Author Topic: PLA breaking  (Read 202 times)

ggallant571

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PLA breaking
« on: July 31, 2017, 05:32:09 PM »
I have two spools of Red PLA. Purchased about 3 years ago. Kept in sealed bag with some sort of moisture bag. One spool works great, the other typically breaks inside the extruder after about 30 minute. I have no problem trashing the bad spool but need another spool and no not wish to have a repeat performance. Bought the printer from Monoprice and was thinking I should order filament from them to be safe. Any thoughts ???
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Zax

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Re: PLA breaking
« Reply #1 on: July 31, 2017, 06:04:14 PM »
3 years is a heck of a long time, depending on humidity where they were stored the desiccant was probably saturated after 6-12 months even in a sealed bag.

Then the moisture begins to get absorbed in the PLA which causes problems when heating it up, you should be able to hear it snap, crackle and pop (like a certain breakfast cereal).

I seal my spools in vacuum bags with moisture monitors and desiccant, unopened they last 2-3 months before needing to have the desiccant replaced. If I open and use them a few times (more common) it may only be 1 month and I will replace it. Once I have a bunch of "used" desiccant I dry it ready for use again.

I've heard you can dry the spools but it's probably not worth the effort. You would need a vacuum chamber.


ggallant571

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Re: PLA breaking
« Reply #2 on: July 31, 2017, 09:56:03 PM »
Thanks.
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Lob0426

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Re: PLA breaking
« Reply #3 on: July 31, 2017, 11:23:45 PM »
I have an 18 month old spool of PLA that works fine and has been out of the bag all that time. BUT this is a low humidity area (High Desert). It is bad for cigars here! LOL!
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kibodwin

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Re: PLA breaking
« Reply #4 on: August 01, 2017, 01:57:56 AM »
I have 2 year old pla that seems ok, I too have the little silicate (?) bags. I have heard of people putting the whole spool in teh oven overnight at a very low temp to dry out the filament... not too sure about it though.
Could not upping the nozzle temp help boil off the humidity? I understand it would have no where to go but it sound better than putting the spool in the oven overnight!
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Zax

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Re: PLA breaking
« Reply #5 on: August 01, 2017, 05:08:14 AM »
Don't put the spool in the oven, unless you want a real mess  :-\

I doubt using silica (desiccant) in a bag with the spool would pull out the moisture once it's been absorbed, but it wouldn't hurt.




kibodwin

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Re: PLA breaking
« Reply #6 on: August 01, 2017, 05:37:49 AM »
or dry rice like people do with wet iphones??
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Lob0426

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Re: PLA breaking
« Reply #7 on: August 01, 2017, 11:54:38 AM »
Don't put the spool in the oven, unless you want a real mess  :-\

I doubt using silica (desiccant) in a bag with the spool would pull out the moisture once it's been absorbed, but it wouldn't hurt.

Oh come on I wanted to see that! LOL!
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ThothLoki

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Re: PLA breaking
« Reply #8 on: August 01, 2017, 12:51:10 PM »
That would have been an awesome 3D print of a blob
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ggallant571

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Re: PLA breaking
« Reply #9 on: August 01, 2017, 01:33:03 PM »
How about I send the spool to you. I'm sure your SO is much more tolerant than mine!!
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ThothLoki

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Re: PLA breaking
« Reply #10 on: August 01, 2017, 01:35:18 PM »
How about I send the spool to you. I'm sure your SO is much more tolerant than mine!!

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Lob0426

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Re: PLA breaking
« Reply #11 on: August 01, 2017, 08:21:00 PM »
How about I send the spool to you. I'm sure your SO is much more tolerant than mine!!

If I kept it here for a month it would probably dry out and be useable. But shipping sucks for the weight!
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Stonemull

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Re: PLA breaking
« Reply #12 on: August 02, 2017, 12:20:54 AM »
The only filament I have had break, quite regularly, was an uncoloured ABS. It did not like to be left bent. If I left it in the printer for over a week it would invariably snap above the extruder usually during the homing process but sometimes during the first few layers.
The solidoodle is a bit cramped up top and the extruder is only an inch from the top case so it used to bend the filament at that point.
What I would do if not used for a few days is heat the extruder up and then extrude about 50mm, then print as usual.
I have a clear red abs that looks like it wants to break too, goes rather pink at the bend.
The natural abs was my favourite filament for strength, it stuck to the bed well amd made parts that are incredibly tough, I think the dyes used weaken the plastic bonding, I stick to natural colours for strong parts.
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kibodwin

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Re: PLA breaking
« Reply #13 on: August 02, 2017, 12:30:21 AM »
how about trying to dry it off in the microwave....
it works for recharging iphone so sounds like a great plan (NOT).

I know, now I am just being silly!!
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