hot end clog?

[hakanai]

Hello, I just finished my rostock max using al the stock parts. Old extruder and steve's hot end. the extruder seems to be calibrated correctly and everything seems to work until it is time to actually extrude something through the hotend. With the head in the air I tell it to extrude 15mm and the extruder runs 15mm while nothing comes out of the hot end. Then a few seconds later a slow little worm begins to appear and creaps it's way out of the hot end never really getting to a full 15mm.
If I try and print a small test object, by the time it thinks it is 1 or 2 layers up it barely has enough material balled up on the tip to be 15 or 20mm.
I had been using 205c for the tip temp but upped to 220c with no improvement. I have tried upping the extrusion multiplier, no help. When I retract the filament from the hot end and take the nozzle and PEET out there is a little piece of ABS still right down in the nozzle. Is that normal or is that a clog? Do I simply run the temp up and let it ooze out over the course of a few minutes or do I need to something more active to clear it?

Does this sound familiar to anyone? I am struggling to get my first print going and it's killing me! I would be so happy with the worst cube ever right now

thanks

[cambo3d]

could be a lot of things here,

check if you have/are using 1.75mm filament in your settings and hardware.

having filament in your nozzle is normal after, some extrusion. it will come out on your next extrusion cycle. wouldn't necessarily mean its jammed in here. unless its at the cold side which i doubt.

have you checked your steps per mm for your extruder it should something like 584 for steves extruder.

[hakanai]

yeah setting are all as you mentioned (steps per mm and filament size). So I a m a bit perplexed as to why it is doing this. It is strange sometimes I touch the filament going into the extruder to make sure it is actually moving, and it is, but next to nothing is coming out of the hot end. Maybe my nozzle has a black hole in it and somewhere in space there are small squiggly piles of abs.

I'll keep messing with it. I do have a new ezstruder and e3d hotend coming so maybe it will all be moot soon enough.

thanks

[cambo3d]

are you making these changes in eeprom via rephost? firmware has eeprom enabled by default so any changes you make to firmware, get overridden by eeprom values. something else to check.

[hakanai]

I have been doing things in eeprom, but is the filament size adjustable there? I haven't seen it, is it adjustable in the firmware with arduino? I have it set to 1.75 in slic3r but that is the only place I have seen it as an option.

[cambo3d]

another guy on the forum had a similar issue, he solved by selecting the correct size filament. I forget where though but its not in the firmware. maybe in the slicer filament settings but you said you already checked it...hmmm

[geneb]

Printing ABS at 205-220 isn't going to help - try 230-240.

g.

[dsnettleton]

It is strange sometimes I touch the filament going into the extruder to make sure it is actually moving, and it is, but next to nothing is coming out of the hot end. Maybe my nozzle has a black hole in it and somewhere in space there are small squiggly piles of abs.

Whenever I get a jam, the motor is feeding filament into the extruder, but not the bowden tube. It creates a wad of squiggly filament out the side of the extruder enclosure, making quite a mess. I would check to make sure that hasn't happened. Change your filament and if it has, you'll know right away, and no amount of extrusion at any temperature is going to help until you've got it cleared up.

[hakanai]

SUCCESS! 235c works a treat. now to mess with everything!

thanks for the help

[cambo3d]

on that note, have you checked the calibration of your temperature readings against a thermocouple meter. My guess would be that your temps are off.

I can print at 215c i've even tried 200c, and it still prints, this was with the stock steves hotend.

[cpunches]

I would heartily recommend checking your temps too. I bumped my temps up to 220 it would help my prints and melted my hotend due to the temps being off about 15 degrees.