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Alexander Bilgri  
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 More options Oct 1 2012, 2:59 pm
From: Alexander Bilgri <abil...@gmail.com>
Date: Mon, 1 Oct 2012 13:59:00 -0500
Subject: Reprap issues

Hi all,

Alright, I'm probably just being an idiot but someone might be able to help
me. I've been putting together my Reprap and I've been successful right up
until the extrusion. It appears like the heater doesn't have a fast enough
recovery time so after extruding a few centimeters of ABS it slows to a
stop and the hobbed bolt just grinds at the filament.

I am using 3mm filament with a RAMPS 1.4 board flashed with Sprinter. I
have an ultimaker hotend. My PSU is rated for enough power. Any suggestions?

If I can't solve it myself, I could drop off my Gordian knot at S67 and
give the winner a spool of filament. Or a six-pack.

Thanks,
Alex


 
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Chris Meyer  
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 More options Oct 1 2012, 3:29 pm
From: Chris Meyer <water...@gmail.com>
Date: Mon, 1 Oct 2012 14:28:57 -0500
Local: Mon, Oct 1 2012 3:28 pm
Subject: Re: [S67 Public] Reprap issues

What temperature are you printing at?  Are you using a thermocouple or a
thermistor for feedback?  Have you confirmed the temperature at the tip
with another temperature measuring tool?

Chris


 
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Charles Allhands  
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 More options Oct 1 2012, 3:29 pm
From: Charles Allhands <allhand...@gmail.com>
Date: Mon, 1 Oct 2012 14:29:28 -0500
Local: Mon, Oct 1 2012 3:29 pm
Subject: Re: [S67 Public] Reprap issues

I've encountered this problem before and there are a lot of things that
could cause it. Could you include more details? Maybe a link to the exact
version of extruder you are using, nozzle diameter, a picture of the hobbed
bolt (it may not be hobbed very well), the resistor being used, etc. The
more information the better.

         -Charles


 
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Alexander Bilgri  
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 More options Oct 1 2012, 4:34 pm
From: Alexander Bilgri <abil...@gmail.com>
Date: Mon, 1 Oct 2012 15:33:45 -0500
Local: Mon, Oct 1 2012 4:33 pm
Subject: Re: [S67 Public] Reprap issues

It's a 100K NTC thermistor. I have not checked the temperature with any
precision, but it seems close (just a glass bulb mercury thermometer). I
have tried it at the Printrun default of 230C.

I have this kit with a .5mm nozzle:
http://ultimachine.com/content/makergear-hot-end-kit-3mm-filament

The hobbed bolt will grind off the filament, so I think that is not the
issue.

Thanks!

On Mon, Oct 1, 2012 at 2:29 PM, Charles Allhands <allhand...@gmail.com>wrote:


 
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Tim Bertram  
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 More options Oct 1 2012, 5:07 pm
From: Tim Bertram <bertr...@gmail.com>
Date: Mon, 1 Oct 2012 16:07:28 -0500
Local: Mon, Oct 1 2012 5:07 pm
Subject: Re: [S67 Public] Reprap issues
If your using an ATX power supply you may need load (resistor or light
bulb) on the 5V line to get full output on the 12V lines.

http://reprap.org/wiki/Balancing_ATX_Supplies

-Tim


 
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Joe Kerman  
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 More options Oct 1 2012, 5:20 pm
From: Joe Kerman <jker...@gmail.com>
Date: Mon, 1 Oct 2012 16:20:52 -0500
Local: Mon, Oct 1 2012 5:20 pm
Subject: Re: [S67 Public] Reprap issues

Push the filament by hand until you figure it out,  it will save you having
to clean out the hobbed bolt.

Are you sure it's a temp drop, and not a clogged nozzle?  How low does
printrun say the temp gets after pushing?

I'm also curious how fast your hotend heats up from cold, it's a good clue
if your psu is putting out the juice it says it is

On Oct 1, 2012, at 1:59 PM, Alexander Bilgri <abil...@gmail.com> wrote:

Hi all,

Alright, I'm probably just being an idiot but someone might be able to help
me. I've been putting together my Reprap and I've been successful right up
until the extrusion. It appears like the heater doesn't have a fast enough
recovery time so after extruding a few centimeters of ABS it slows to a
stop and the hobbed bolt just grinds at the filament.

I am using 3mm filament with a RAMPS 1.4 board flashed with Sprinter. I
have an ultimaker hotend. My PSU is rated for enough power. Any suggestions?

If I can't solve it myself, I could drop off my Gordian knot at S67 and
give the winner a spool of filament. Or a six-pack.

Thanks,
Alex

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Charles Allhands  
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 More options Oct 2 2012, 10:09 pm
From: Charles Allhands <allhand...@gmail.com>
Date: Tue, 2 Oct 2012 21:09:28 -0500
Local: Tues, Oct 2 2012 10:09 pm
Subject: Re: [S67 Public] Reprap issues

When you push the filament through by hand does it stop shortly after as
well? If so, if you wait 30 seconds and then try pushing again does the
problem repeat or does it still not extrude?

   -Charles


 
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Alexander Bilgri  
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 More options Oct 3 2012, 10:07 am
From: Alexander Bilgri <abil...@gmail.com>
Date: Wed, 3 Oct 2012 09:07:20 -0500
Local: Wed, Oct 3 2012 10:07 am
Subject: Re: [S67 Public] Reprap issues

I will have to try. Monday and Tuesday are busy days and I have an exam
Friday. So, Friday afternoon I will restart the fiddling process.

Thanks for the tips everyone!

On Tue, Oct 2, 2012 at 9:09 PM, Charles Allhands <allhand...@gmail.com>wrote:


 
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Alexander Bilgri  
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 More options Oct 16 2012, 5:03 pm
From: Alexander Bilgri <abil...@gmail.com>
Date: Tue, 16 Oct 2012 15:02:38 -0600
Local: Tues, Oct 16 2012 5:02 pm
Subject: Re: [S67 Public] Reprap issues

Thanks everybody! It was a synergistic problem of not enough current, poor
insulation, and a poorly gripping hobbed bolt. Solved!

Now a new problem has emerged (grumble grumble jamming X-carriage) but this
one has an obvious solution. Almost there!

Cheers,
Alex


 
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