Printer Jam

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Carnivore
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Printer Jam

Post by Carnivore » Thu Jun 05, 2014 9:23 pm

I'm experiencing a printer jam with my 10 month old UP plus 2 printer. It would jam after x-minutes and not extrude anything. I've tried using different vendor plastics with no success. I've disassembled the printing head and cleaned it with acetone. It would print a 1 hour print job successfully but when I try to print another one, it would jam. Any suggestions?

Chris botha
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Re: Printer Jam

Post by Chris botha » Thu Jun 05, 2014 9:51 pm

maybe its not the nozzle jamming.. maybe your stepper is siezed(seizing) or is full of gunk?

Carnivore
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Re: Printer Jam

Post by Carnivore » Thu Jun 05, 2014 9:58 pm

I've also cleaned out the stepper and it does function

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JuliaDee
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Re: Printer Jam

Post by JuliaDee » Fri Jun 06, 2014 1:25 am

An acetone soak is not always enough to clear a nozzle. Best to simply replace the nozzle if other methods don't succeed.

When you say "jam", do you mean that the stepper is producing clicking noises when it tries to extrude? That would indicate a clog, jam, or spool tension problem. If there are no clicking noises, rather the stepper shaft is turning but no filament is extruding, then you have a slippage problem in the feeder, which can have similar causes but maybe different solutions. Sometimes slippage is caused by the feed gear having worked its way out on the shaft so that it's no longer aligned with the filament. If you remove the motor from the printer completely, you can gently tap the gear back onto the shaft using a small hammer and a piece of tubing, being careful to support the opposite end of the shaft so you don't ruin the bearings.

Carnivore
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Re: Printer Jam

Post by Carnivore » Fri Jun 06, 2014 3:52 pm

@JuliaDee
It does not produce the clicking sound associated with a clog. Rather it 'air prints'.

I've disassembled the heating chamber and nozzle and have soaked it in acetone inside a sonicator. I've successfully printed a 4 hour print job. Now I'm going to redo the print to see if it jams.

Chris botha
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Re: Printer Jam

Post by Chris botha » Fri Jun 06, 2014 10:44 pm

if its not the nozzle thats clogged, and its not the stepper stalling, another logical reason would be:

1. A poor connection in your heater circuit, dropping the heat under extrude temp?
(if you have an aftermarket temp controller I would start looking there.. otherwise heater circuits tend to get quit brittle at the heat source, check for loose connection on the heater block)

2. your feed pipe is jamming the filament against the feed guide (where your filament goes into the pipe from the roll and meets the guide)
The stepper is a little weeny weeny thing with negligible torque and if a jam occurs on the other end on mine (twisted filament or issue above) my stepper doesnt make noise either, no clicking etc, it just prints air.
I usually know this is happening if i don't hear the creaking noise the filament roll makes on the spool holder.. To stop that issue I printed a new filament guide with a length of "tube" in it that the feed tube fits into, and haven't had an issue yet.

3. See this thread: last post. a "skew head presumably will also cause jams? http://www.pp3dp.com/forum/viewtopic.ph ... =40#p40803

Carnivore
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Re: Printer Jam

Post by Carnivore » Sun Jun 08, 2014 6:20 pm

UPDATE: i got my printer to unjam.

What I did was disassemble the heating chamber and nozzle. I placed the heating chamber and nozzle into seperate vulcan tubes filled with acetone and sonicated it for an hour. Now it can print larger prints.

UPDATE: It jammed again. I'll post a picture of the filament end

UPDATE: On the filament, there's a circular bite (half moon) into the filament meaning the stepper slipped.

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JuliaDee
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Re: Printer Jam

Post by JuliaDee » Mon Jun 09, 2014 12:27 am

What filament are you using?

Carnivore
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Re: Printer Jam

Post by Carnivore » Mon Jun 09, 2014 11:27 am

Monoprice.

When the printer jammed again, I noticed that my stool holder was crooked and the stool was sliding away from the machine. I think what happened is that the stool would slide away from the machine for longer prints and it would cause it to jam because it was at an angle?

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Re: Printer Jam

Post by roller » Mon Jun 09, 2014 2:10 pm

Carnivore wrote:Monoprice.

When the printer jammed again, I noticed that my stool holder was crooked and the stool was sliding away from the machine. I think what happened is that the stool would slide away from the machine for longer prints and it would cause it to jam because it was at an angle?
Oh dear, many giggles. I hope you mean "spool". Otherwise, TMI.

Carnivore
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Re: Printer Jam

Post by Carnivore » Mon Jun 09, 2014 3:29 pm

LOL I just noticed my auto correct did that.

I think it could be my nozzle. Everytime I get a jam, and withdraw the filament, I see a chewed up portion

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Re: Printer Jam

Post by roller » Tue Jun 10, 2014 1:55 pm

Be sure to check your feed tube too. It's easy to focus on the nozzle and overlook the tube above that can get backed up.

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JuliaDee
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Re: Printer Jam

Post by JuliaDee » Tue Jun 10, 2014 2:07 pm

Carnivore wrote: I think it could be my nozzle. Everytime I get a jam, and withdraw the filament, I see a chewed up portion
The fact that you see a chewed-out crescent in your filament only means that the feed gear was grinding it out while something else stopped the movement of the filament. It does not point to any particular cause, which could be any or all of the following: clogged nozzle, blocked feed tube, stuck spool, low nozzle temperature, etc. You need to start eliminating variables. A fresh unused nozzle would be a good place to start imo.

roller
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Re: Printer Jam

Post by roller » Tue Jun 10, 2014 2:15 pm

Yeah, what Julia says. I always forget to say it but first thing I do when I have a feed problem that is not obvious is hand feed my hotend. Just take the heatsink/feeder assembly off and use the software to issue an extrude and hand push it through. You should have a little backpressure but not a lot. Unfortunately I have done this many times (I've built so many repraps I want to cry) so I have a feel for it but it's hard to describe how much backpressure suggests an issue.

So I guess it's a good thing to do when your extruders working perfectly so you know what it should feel like should this day come.

Carnivore
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Re: Printer Jam

Post by Carnivore » Tue Jun 10, 2014 4:52 pm

I've changed up the spool and used a new plastic tubing so I can elminate those. I've also purchased a new nozzle that's coming this Friday.

Carnivore
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Re: Printer Jam

Post by Carnivore » Tue Jun 10, 2014 10:45 pm

I found out what the culprit was: the filament. Please do NOT use filament from monoprice.com!

I swapped it out with another filament and it worked just fine!

roller
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Re: Printer Jam

Post by roller » Wed Jun 11, 2014 7:20 am

I say it over and over like a broken record but many of the cheap filament from non specialist suppliers I will not touch them with a 3048mm pole. Many have sizing which is not uniform, crud within the print and may even off gas all sorts of noxious stuff. If you are lucky enough to get a good filament from such a supplier there is no guarantee the next roll will come from the same source. As such, I stick with good suppliers that specialise in filament and source suppliers with reliable, quality filament.

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JuliaDee
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Re: Printer Jam

Post by JuliaDee » Wed Jun 11, 2014 10:45 am

Carnivore wrote:I found out what the culprit was: the filament. Please do NOT use filament from monoprice.com!

I swapped it out with another filament and it worked just fine!
You're the guy that the printer manufacturers use to justify trying to limit us to their own proprietary filaments! "Users may have unexpected problems or cause damage to the printer by using unauthorized materials..."

;)

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Re: Printer Jam

Post by roller » Sun Jun 15, 2014 3:16 am

Actually on that note ... I went back to a roll of OEM for the first time in ages and realised my standards of what was acceptable had slipped over time - seeing just how perfect the print was came as a surprise. This is not to blame the filaments - I buy nice consistent but vastly cheaper filaments (than OEM) to use most of the time. Instead it reminded me I had not been taking the time to dial in the right temp for new purchases and had been living with blemishes I shouldn't have had. I must remember to do my test prints for all new filaments.

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JuliaDee
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Re: Printer Jam

Post by JuliaDee » Sun Jun 15, 2014 10:53 am

roller wrote:Actually on that note ... I went back to a roll of OEM for the first time in ages and realised my standards of what was acceptable had slipped over time - seeing just how perfect the print was came as a surprise. This is not to blame the filaments - I buy nice consistent but vastly cheaper filaments (than OEM) to use most of the time. Instead it reminded me I had not been taking the time to dial in the right temp for new purchases and had been living with blemishes I shouldn't have had. I must remember to do my test prints for all new filaments.
Very true, and I've been guilty of the same thing. Delta Micro filament is still the Gold Standard.

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