1 Topic by Ggalisky (edited by Ggalisky 2014-12-20 22:16:45)

  • Ggalisky
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Topic: 3mm extrusion questions problems etc.

This morning I decided to drill out a non melt filter nozzle with a 7/64 bit ( as recommended in the Filastruder assembly pdf). I drilled it out by hand without a drill press. I am concerned about a few things: Is the hole I drilled clean enough, and is it round enough. ( I think it is)

After installing the new nozzle, I noticed that filament being produced was shinny and smooth like it should be, however I did not check my temps then. (this was done horizontally) Next I set up my Filastruder for vertical extrusion, and that is when I ran into a few problems.

At 170 degrees Celsius, the filament extruded looked rough, almost like 1.75mm filament that was extruded too hot.

At 155 degrees Celsius, the filament looked slightly rough and more shinny but not quite there.

How can ABS exrtrude so cold at 3mm? It looked like I was getting maybe 3-6in per minute. This is with GP35. Another thing to note was that the temps usually hovered about 5 degrees bellow the set temp. I do not think something is wrong with my heater band or thermocouple, since I extruded 1.75mm just fine at 195 degrees Celsius a few days ago. The diameter of the produced filament was not a problem at around 2.87. This was done on a stock Filastruder with no modifications.

Next, the servo motor for the filament guide on the Filawinder was vibrating horribly. I did install the base extension on the Filawinder, so I know that is not the problem. The Filawinder functioned just fine with 1.75mm.

Thanks.

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2 Reply by cor5151 (edited by cor5151 2014-12-22 03:48:21)

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Re: 3mm extrusion questions problems etc.

155 is too low for abs, sounds to me like the thermal couple isn't seated good enough. do you get skips in temp if you touch it? also if the fan is blowing on it, the nozzle temp will read lower, i usually wrap the thermal couple into the hole with kapton tape, or put some aluminum foil in front of the hole if the fan is blowing on it. 3mm is usually easier then 1.8, usually i use a 177ish temp for 3mm, vertical with a winder.. also the vibrating of the servo happens when its trying to move but can't, this is a lot more common with 3mm than 1.8 because its thinker and takes more force to bend/move.

the rough/bubbley texture of the filament is caused by being to hot. or moisture in it or the masterbatch.
had a lot of this using gitd masterbatch that wasn't properly dried, dried it out and extruded fine.

nozzle might play a role to if its too rough in the die, if nothing else it might be worth taking it out and running the drill bit in reverse in it to smooth it out some.

3 Reply by elmoret

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Re: 3mm extrusion questions problems etc.

Rough means too hot, probably the thermocouple isn't inside a hole in the nozzle. Did you drill such a hole, or did you just tape it to the outside? The latter won't work.

If the servo motor is vibrating, you are overworking it. Might need a longer extension.

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