PLA printing never works

Talk about anything.
stormychel
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Re: PLA printing never works

Post by stormychel » Wed Oct 15, 2014 6:43 pm

Carnivore wrote:Opening the latch to allow air from the bed upwards seemed to do the trick. I'll post a picture.
The opposite of logic because you pull hot air up to the heatsink, but cool if it works that way :shock:
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Carnivore
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Re: PLA printing never works

Post by Carnivore » Wed Oct 15, 2014 7:07 pm

False alarm, it jammed trying to do a 17 minute job but prints fine for a 4 minute. Since your .stl was too flimsy for me to print, I just hot glued the fans to the electronic chassis

Image

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stormychel
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Re: PLA printing never works

Post by stormychel » Wed Oct 15, 2014 7:40 pm

Positioning of the fans is about the same so it should work... so weird I prefer PLA with this printer since the mod... works so well now, well same as ABS but without the warping...

Checklist:

- did you open the feeder chamber and clean the gear? An old toothbrush is perfect for this.
- fan directions as specified? (from the look of it I think they are)
- latch / wind barrier closed?
- printing with bottom door closed?
- And top door open

Also, right after startup, when stepper is cold, does the PLA extrude well manually?
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stormychel
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Re: PLA printing never works

Post by stormychel » Wed Oct 15, 2014 7:41 pm

Also your side fan seems thicker than the stock one, doesn't it bump into the enclosure?
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stormychel
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Re: PLA printing never works

Post by stormychel » Wed Oct 15, 2014 7:45 pm

Looked at the pics again, are you sure your fans blow against the stepper, instead of extracting heat from it?

EDIT: if the fans turn clockwise they should be turned around, looking at the blades they seem to extract air that way... Sounds stupid but this is very delicate and I spent a whole night on testing all possible configurations....
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Carnivore
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Re: PLA printing never works

Post by Carnivore » Wed Oct 15, 2014 8:06 pm

I cleaned the stepper teeth and glued close the bottom latch so no heat from the hot end is coming into. So far it's printing a smaller 5 minute piece fine. I'll try printing a larger piece to find out.

EDIT: It jammed during a 15 minute print and only got to 7 minutes before it prints in the air.

stormychel
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Re: PLA printing never works

Post by stormychel » Wed Oct 15, 2014 8:58 pm

Carnivore wrote:I cleaned the stepper teeth and glued close the bottom latch so no heat from the hot end is coming into. So far it's printing a smaller 5 minute piece fine. I'll try printing a larger piece to find out.

EDIT: It jammed during a 15 minute print and only got to 7 minutes before it prints in the air.
Weird... Do you have another spool of PLA to test with? I finished a couple of 2-hoor prints today with the same setup... :roll:
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stormychel
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Re: PLA printing never works

Post by stormychel » Wed Oct 15, 2014 9:37 pm

It's the orientation of your additional fans, you need to turn them around...
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Carnivore
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Re: PLA printing never works

Post by Carnivore » Wed Oct 15, 2014 9:56 pm

Which way should each fan be pointed?

Right now I have the main fan pointed away from the heatsink.

And the other 2 fans pointed towards the stepper motor.

stormychel
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Re: PLA printing never works

Post by stormychel » Wed Oct 15, 2014 10:03 pm

Carnivore wrote:Which way should each fan be pointed?

Right now I have the main fan pointed away from the heatsink.

And the other 2 fans pointed towards the stepper motor.
The way you describe is correct, but if your fans turn clockwise, aren't the blades positioned to suck air away from the stepper as well???

Might be wrong, I can be quite dumb sometimes... :)
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stormychel
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Re: PLA printing never works

Post by stormychel » Wed Oct 15, 2014 10:16 pm

Ok... Don't know what else it could be then.. :geek: you have the exact same setup as me...
10486011_1495060184111016_2008343054246892765_o.jpg
10486011_1495060184111016_2008343054246892765_o.jpg (191.01 KiB) Viewed 11290 times
I made 2 of these a few days ago, mudguard for a wheel chair, they consist of 7 1.5 a 2 hour prints each in cheap black PLA (19 euros / kg). This stuff barely worked before the fan mod..
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Carnivore
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Re: PLA printing never works

Post by Carnivore » Wed Oct 15, 2014 10:36 pm

I will double check the direction of my fans. But I do believe the side with the electronics is usually the side that air comes out.

stormychel
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Re: PLA printing never works

Post by stormychel » Wed Oct 15, 2014 10:42 pm

Carnivore wrote:I will double check the direction of my fans. But I do believe the side with the electronics is usually the side that air comes out.
Yes, it's that way on the stock fan too...

Hope you get your PLA-problems solved... it's such a relief, not worrying about warping like with ABS...
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Carnivore
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Re: PLA printing never works

Post by Carnivore » Thu Oct 16, 2014 1:18 am

I just checked the direction of the air current and the two fans that are glued to the plastic chassis are blowing air on the stepper.

roller
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Re: PLA printing never works

Post by roller » Fri Oct 17, 2014 3:29 am

stormychel's solution is new and may not work for everyone. There is a variation in the heat stepper motors produce from model to model and I suspect since I've been able to compare a couple of Plus 2s in person even between printers of the same model. I suspect they only approximately dial in the current setting on the mainboard (I should look to see if it is variable sometime). Either way, there are a few factors that have an effect:

- The print job
- The motor's specific heat output
- The ambient temp
- Ambient humidity
- Quality of PLA (specifically softening point)

So it might be that stormychel is lucky - time will tell as others attempt the mod. You may also just be unlucky. There has been plenty of dicussion of tried and true solutions to PLA cooling just use google to searhc the forum. I certainly know I've answered the question at least 10 times pointing to earlier discussions.

stormychel
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Re: PLA printing never works

Post by stormychel » Fri Oct 17, 2014 6:18 am

I think and hope it's the PLA...
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Carnivore
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Re: PLA printing never works

Post by Carnivore » Sat Oct 18, 2014 3:33 pm

Image

I glued the bottom of the air intake. Still nothing.

stormychel
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Re: PLA printing never works

Post by stormychel » Sun Oct 19, 2014 7:48 am

There's a lot of PLA where it shouldn't be... are you sure it is dry enough?

What are the results with your other PLA spools?

What is the recommended extrude temperature for that spool?
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roller
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Re: PLA printing never works

Post by roller » Mon Oct 20, 2014 3:53 am

stormychel wrote:There's a lot of PLA where it shouldn't be... are you sure it is dry enough?

What are the results with your other PLA spools?

What is the recommended extrude temperature for that spool?
You kinda should kind of ignore recommended temps ... it is not really an absolute temp you get at an extruder anyway and there may be 5-10C diffence to the temp your extruder and mine produces at the same temp just due to coupling inconsistencies ... and what we all read as 260C may be only 250C (or 270C) in the melt chamber due to the natural heat conduction path. So the temps are really relative ather than absolute and should be taken as a start point to find the real temp but you need to walk the temp up and down to find what is ideal for a particular filament. Generally we can share the info between our Up printers because the variation is generally only about 5C - not enough to make a difference.

GeoM528
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Re: PLA printing never works

Post by GeoM528 » Wed Oct 22, 2014 2:52 pm

My friend had success on 3D printing with 3D2print’s PLA filament on UP printer! If you encounter same problem again with other material, better contact your printer provider.

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