1 Topic by COASTER19

  • COASTER19
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  • Registered: 2013-03-08
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Topic: Random (?) Barrel Rotation

I've been happily extruding vertically for a while now, and recently swapped my nozzle out (only major change in the past month).  After about 15 minutes of running, I heard an odd creek from the machine, and looked over to find this:
http://i.imgur.com/M2y0gjR.jpg

The barrel had rotated itself almost 90 degrees!  This wouldn't be an issue if my feed were as consistent as it used to be, but it is not.  I let the heat soak for 15 minutes after it was up to temperature (187 C), and the shaft's dowel pin did not slip (a previous issue). 

Does anyone have any idea why could the barrel could find the extra room to rotate?  Thanks in advance!

2 Reply by elmoret

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Re: Random (?) Barrel Rotation

Is that a towel over the heater? There is no way that is rated for the temperatures involved.

Barrel rotation happens when it wasn't sufficiently tightened during assembly, or something happens to cause the auger to apply more torque than usual to the barrel (not letting the plastic melt, something shifting to allow misalignment, having to slice through several pellets at once, etc)

Main concern is that towel, man. Not safe.

You also definitely shouldn't have that clamp there, as you run the risk of transferring thrust load to the motor.

Filastruder - the robust, inexpensive filament extruder
E3Dv6 All Metal Hotend - the premier 3D printing hotend

3 Reply by COASTER19

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Re: Random (?) Barrel Rotation

Okay then... towel coming off.  I tested it in the oven to see what would happen around 200 degrees Celsius and all was fine, but I do see the danger in that since the thermistor is in the nozzle, not the heating band... I just don't like the fiberglass type which gets everywhere.  There was this lavawrap stuff on amazon which I'll probably get to replace it.

Anyway, so I should probably remove the bolts and rotate the flange 90 degrees right?

4 Reply by elmoret

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Re: Random (?) Barrel Rotation

Yes, something like this would be fine:

http://www.amazon.com/010128-Titanium-E … eader+wrap

The problem with cotton is that is burns. Fiberglass wrap (whether it comes on a as a roll or as pipe insulation) doesn't - or at least not under 650C.

Yup, pull the 4 main bolts and rotate the flange. I doubt it'll happen again. now, 90deg on a NPT fitting is a pretty solid amount of torque.

Filastruder - the robust, inexpensive filament extruder
E3Dv6 All Metal Hotend - the premier 3D printing hotend

5 Reply by COASTER19

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Re: Random (?) Barrel Rotation

Hey that's cheaper than the stuff I was looking at!  It will be a lot of wraping since it is 1" wide, but I'm definitely up for it!  Thanks!

6 Reply by insta

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Re: Random (?) Barrel Rotation

I used 40 feet of that header wrap on my Filastruder, it's approximately a 3" diameter wad all the way to the hopper.  I hit temperature very quickly and get 12-16" per minute with a melt filter and 1.75 nozzle.