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Topic: Getting quality output

I've got mine together and have let it run a few hours at 180 degrees.  I seem to have a little issue getting some good quality filament at 3mm.  The extrusion process seems to be going pretty well, but once the filament hits the floor and start wiggling around, it messes up the filament coming out of the nozzle causing it to get all bent and twisted.  In more resembles a machine to make tails for pigs with the corkscrew looking output if there is any resistance or drop in pull (from gravity).  What can you suggest to make the output something worth using?  Maybe lower the temperature?

Thanks!

-John

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Re: Getting quality output

Try putting the extruder higher up, and make sure there isn't anything for the filament to bump into as it coils on the ground.

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Re: Getting quality output

How long is the board? Did you follow the instructions for filament guide placement?

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Re: Getting quality output

Taking some clues from your questions, I went back and re-evaluated my setup.  The end of my board where the filament guide is was much longer than necessary, so I cut the end off after flush with the filament guide block and let the filament droop down to the floor while passing over the guide.  That seemed to help a lot.  I did put the filament guide the requisite distance from the nozzle, so I don't think that was an issue.  It seems to be doing much better now.

The only other item to work out is spooling as it is produced.  I see a few designs out there on automatic spoolers, but none that I really like.  The reason this is needed is to better control the filament once it is on the ground.  I just let it run for a few hours (and watched it).  Every so often, the filament would get where it wants to spring into another position and has a dramatic flop around on the ground, totally disturbing the output.  For the most part, it is pretty good looking quality if I can just keep the filament on the ground still.  I made a quick and dirty manual spool and holder and that seemed to help quite a bit.  It just needs adjustment every minute or so and that gets a little tedious over a few hours at a time.  I'll be adding some intelligence to this with either a stepper or gearmotor, sensor and Arduino of some sort to coil it for me.

-John

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Re: Getting quality output

John,

I can't recommend cutting the end of the board at the filament guide. That leaves the filament under-constrained, leading to the disturbances you observed when the filament changes position on the ground.

I have created 2kg at a time onto the floor without a puller/spooler, and printed with it directly. When the Filastruder is set up properly, you will not experience kinks or deformations.