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Post by fatsimon on Feb 7, 2018 19:20:59 GMT
I cannot get the filament out of the hot end. It moves about 3 - 4 mm, so its not just stuck at the nozzle, but won't come out? Any ideas to avoid dismantling the head again? And what is the right way to change filament, I hav enever been able to change easily.
Thanks
Simon
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Post by tanephar on Feb 8, 2018 9:24:38 GMT
My technique for changing filament is as follows, with a cold nozzle, release the bowden tube from the hot end capture, slide the tube back up roughly 50mm (2") and cut the filament at this point, remove the filament from the extruder and fit your new filament, into the bowden tube with about 50mm extending past the end.
Now pre-heat the hot end, when it is up to temperature, push the excess filament through until it has a nice flow, now reverse the movement and remove the filament. Load the new filament by feeding the excess into the hot end, until the tube connects and seats in the capture gland. Using either the LCD screen or slicer, extrude 10mm at a time until you start to get a flow, then do a 100mm extrusion, which gives you an even color.
I'm taking an educated guess here, but I would say you have pulled the filament with it below flow temperature and broken it off, leaving a bulge that won't lift out of the throat, and inhibiting the flow to the nozzle. Bad news is you will have to take the hot end apart.
I have been in the process of better organizing my workshop, so will be setting up my printer and putting new filament in so will take a series of pics to post as a guide of my technique. A quick note too is I remove and change filament while I run a PID autotune.
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Post by kioskfan on Feb 8, 2018 23:40:12 GMT
My technique for changing filament is as follows, with a cold nozzle, release the bowden tube from the hot end capture, slide the tube back up roughly 50mm (2") and cut the filament at this point, remove the filament from the extruder and fit your new filament, into the bowden tube with about 50mm extending past the end. Now pre-heat the hot end, when it is up to temperature, push the excess filament through until it has a nice flow, now reverse the movement and remove the filament. Load the new filament by feeding the excess into the hot end, until the tube connects and seats in the capture gland. Using either the LCD screen or slicer, extrude 10mm at a time until you start to get a flow, then do a 100mm extrusion, which gives you an even color. I'm taking an educated guess here, but I would say you have pulled the filament with it below flow temperature and broken it off, leaving a bulge that won't lift out of the throat, and inhibiting the flow to the nozzle. Bad news is you will have to take the hot end apart. I have been in the process of better organizing my workshop, so will be setting up my printer and putting new filament in so will take a series of pics to post as a guide of my technique. A quick note too is I remove and change filament while I run a PID autotune. Well done, thanks for putting this down. |
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ralf
Junior Member
Posts: 93 
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Post by ralf on Feb 10, 2018 10:34:41 GMT
Hello, my way to change the filament is quite simple, heat up nozzle to min 180, push the lever of the extruder motor, hold the filament below the motor, push it slowly approximately 5-10 mm and then pull it out fast. Load the the new filament immediately and push it till you feel a resistance, then push slowly again 40mm and you’re done
Worked always for me.
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Post by tanephar on Feb 11, 2018 9:19:03 GMT
Hello, my way to change the filament is quite simple, heat up nozzle to min 180, push the lever of the extruder motor, hold the filament below the motor, push it slowly approximately 5-10 mm and then pull it out fast. Load the the new filament immediately and push it till you feel a resistance, then push slowly again 40mm and you’re done Worked always for me. This was the way I used to do mine until I had a little mishap and ended up with a blocked throat. The shorter the pull the less likelihood of stretching and breakage. The other point I would make is if you have a clean cut filament it is far easier to load next time. |
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