Hobbed bolt issue?

we may need to go over your infill settings exactly as you have them and see whats going on. Let me know when you have some time

 

well those match mine exactly
another indication it may be a hobbed bolt issue is to open teh extruder up as if to change fialment and see if teh current hobbed bolt is caked full of filament grindings and/or if their is a lot of filament dust inside. if it is caked it could be th filament is grinding away at teh same time slowly being extruded in such a way as to create the wispy lines of filament to get laid down instead of regular ones. Check that and let us know

 

yep that is the problem teh filament is probably drifiting around from side to side and not feeding but simply grinding and as the hobbs fill up the feeding becomes less.

make sure the filament is free flowing and not binding on anything before it goes into the extruder
see if you have a grooved hobbed bolt if not get one and this should go away

 

Ok here is a simple test we can do to see if it is your settings or if it is mechanical in nature
go into repetier and slice the object when it finished slicing save the gcode file and upload it here and ask someone to run it I will if I see it or you can message it to me as well
the gcode takes your profile settings and slices it accordingly if I download the gcode file itself it is if I am printing with your exact settings and if it comes out on mine then you have a mechanical issue if it fails on mine then it is a settings issue and we can proceed accordingly

 

Well Marty on my system the gcode you sent seems to work fine so we may have to look back to your printer itself as to the cause of the issue




There are a few things I would alter and some thing where we should focus

two helpful things that will help all of your prints
first I would set my loops for teh skirt to be at 2 and never change it the skirt gives the filament a chance to get flowing properly before the print actually starts getting printed
second here is a post I made with some gcode you can add so every print does does I uses it always and it really helps
check it out
http://forums.robo3dprinter.com/ind...-nozzle-clean-and-your-filament-flowing.1290/

Now back to your issue based on what I saw you speed was great the infil worked and you should have had a great print but you didn't and the filament dust you saw is I believe the biggest clue

A few things as to why this could be happening
1. there may not enough pressure on the filament from the bearing pressing it against the hobbed bolt
2. the nozzle tip or hot end is at least partially clogged
3. the groove on your new hobbed bolt is not perfectly aligned with the hole that guides the filament in to the hot end

there may be others but this what I think

Now 2 seem to be unlikely because when you start the prints you say the layers look great and a partial clog would not do this
that leaves 1 and 3

3 is easy enough to check open the top of the extruder assembly the spring loaded screws and simply look at the position of the grove and the hole below it they need to be as lined up as possible on my grooved hobbed bolt they supplied me with extra washers so I could position it exactly where it need to be
hopefully this is it as this would be easy to fix

1 is harder to determine

what I would do is to completely clean out the extruder top area of dust and make sure the filament is has not clogged the hobbed bolt and make a single print then open it up and look and see if there is any dust. There should noit be any at all I could run mine for week and still never see what you showed in your pic and the real key is the size of the shredded filament mine literally is dust you have chunks
sned pictures of the hobbed bolt the bearing and the alignment all of which should be easily taken in a single pic and then do one print and take another pic from the same view point and upload both

also while it is open make sure that things are operating smoothly (bearing spins hobbed bolt turns with motor smoothly etc)

We'll get it straightened out

 

that does seem to look as if something is jamming it up
There is a video about replacing teh PTFE tube if you get a clog which you may have you should watch that and maybe look into that some when the extruder is open like that and teh hot end is hot and you manually feed filament in it does extrude right??

 

I believe it was on the forums but I can not remember sorry but it is most likely here

That little twist is caused by the extruder pushing it down in the hole but it not having anywhere to go so something is probably stopping it or by the extrusion speed set to high

are you using the standard version of repetier or teh robo one

 

here is the link it is another post
http://forums.robo3dprinter.com/index.php?threads/clogged-extruder.1308/#post-8590