Extruding Issues Hi All, Another day, another problem. I have 3mm filament and a J-head Mk IV hot-end with a 1.75mm nozzle. I'm using a Greg's extruder with a bought hobbed bolt - M4 tap. I was attempting to extrude some ABS on friday. I heated the hot end to 240ºC but the rate of extrusion was very slow, to the point where the hobbed bolt appeared to slip on the ABS and the plastic couldn't move. The plastic was a free sample, so I don't know whether it's just not of a great quality (?) Anyway, I was wondering if anyone has had this issue or if anyone could suggest a fix? Also, whether I should try with PLA instead - is it easier to deal with? Thanks! https://reprap.org/forum/read.php?1,130639,130639#msg-130639 Wed, 14 Oct 2026 09:28:08 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,130639,131458#msg-131458 Re: Extruding Issues https://reprap.org/forum/read.php?1,130639,131458#msg-131458 RocketBoy87 General Sat, 05 May 2012 04:56:41 -0400 https://reprap.org/forum/read.php?1,130639,131457#msg-131457 Re: Extruding Issues https://reprap.org/forum/read.php?1,130639,131457#msg-131457
A good starting point for a 0.35 nozzle would be:

0.35mm nozzle diameter
0.25 layer height
30mm/s perimeter (Marlin) 15mm/s (sprinter)
50mm/s infill (Marlin) 40mm/s (sprinter)
40mm/s solid infill (Marlin) 30mm/s (sprinter)
100mm/s travel (Marlin) 65mm/s (sprinter)
0.5-1.0mm retract at 25mm/s
195c (PLA Marlin) 190c (PLA sprinter)
First layer temp 5-10c hotter
Filament diameter = low average of measured diameter

Leave the rest alone. If the prints are not turning out the problems will most likely be mechanical or firmware calibration (E steps per mm).

Note: The temperatures and speeds should work well with 4043D PLA as well as good quality Chinese filament but that is hard to determine if this is your first machine. So if you are using Chinese filament and have a lot of problems it may be your issue.]]> Sublime General Sat, 05 May 2012 04:46:23 -0400 https://reprap.org/forum/read.php?1,130639,131453#msg-131453 Re: Extruding Issues https://reprap.org/forum/read.php?1,130639,131453#msg-131453 RocketBoy87 General Sat, 05 May 2012 04:33:35 -0400 https://reprap.org/forum/read.php?1,130639,130981#msg-130981 Re: Extruding Issues https://reprap.org/forum/read.php?1,130639,130981#msg-130981 RocketBoy87 General Wed, 02 May 2012 08:02:15 -0400 https://reprap.org/forum/read.php?1,130639,130930#msg-130930 Re: Extruding Issues https://reprap.org/forum/read.php?1,130639,130930#msg-130930 Sublime General Tue, 01 May 2012 18:55:31 -0400 https://reprap.org/forum/read.php?1,130639,130922#msg-130922 Re: Extruding Issues https://reprap.org/forum/read.php?1,130639,130922#msg-130922
So, either my thermistor is reading incorrectly or, could it be possible the batch of ABS I have has a higher melting point?]]> RocketBoy87 General Tue, 01 May 2012 17:49:18 -0400 https://reprap.org/forum/read.php?1,130639,130688#msg-130688 Re: Extruding Issues https://reprap.org/forum/read.php?1,130639,130688#msg-130688 RocketBoy87 General Sun, 29 Apr 2012 17:46:31 -0400 https://reprap.org/forum/read.php?1,130639,130683#msg-130683 Re: Extruding Issues https://reprap.org/forum/read.php?1,130639,130683#msg-130683
I extrude ABS at 230 - 250 deg C depending on the feedrate.

You can also try tightening the idler springs by 1/2 turn until the hobbed bolt stops slipping. ABS needs to be squeezed into the teeth more than PLA does.]]> aplavins General Sun, 29 Apr 2012 17:37:12 -0400 https://reprap.org/forum/read.php?1,130639,130682#msg-130682 Re: Extruding Issues https://reprap.org/forum/read.php?1,130639,130682#msg-130682
I have also found to clean it you can try using a bamboo skewer to push all the molten plastic out of the hotend and then push a new piece of filament in and remove it really quickly. This will usually pull any leftover filament out of the chamber with the contaminants.]]> Sublime General Sun, 29 Apr 2012 17:35:21 -0400 https://reprap.org/forum/read.php?1,130639,130679#msg-130679 Re: Extruding Issues https://reprap.org/forum/read.php?1,130639,130679#msg-130679
3mm filament with a 0.35mm nozzle orifice]]> RocketBoy87 General Sun, 29 Apr 2012 17:29:56 -0400 https://reprap.org/forum/read.php?1,130639,130659#msg-130659 Re: Extruding Issues https://reprap.org/forum/read.php?1,130639,130659#msg-130659
Quote
RocketBoy87
I have 3mm filament and a J-head Mk IV hot-end with a 1.75mm nozzle.

Are you using 3mm filament with a hotend designed for 1.75mm filament?

That would be your problem right there.]]> aplavins General Sun, 29 Apr 2012 16:27:48 -0400 https://reprap.org/forum/read.php?1,130639,130639#msg-130639 Extruding Issues https://reprap.org/forum/read.php?1,130639,130639#msg-130639
Another day, another problem.

I have 3mm filament and a J-head Mk IV hot-end with a 1.75mm nozzle. I'm using a Greg's extruder with a bought hobbed bolt - M4 tap.

I was attempting to extrude some ABS on friday. I heated the hot end to 240ºC but the rate of extrusion was very slow, to the point where the hobbed bolt appeared to slip on the ABS and the plastic couldn't move. The plastic was a free sample, so I don't know whether it's just not of a great quality (?)

Anyway, I was wondering if anyone has had this issue or if anyone could suggest a fix? Also, whether I should try with PLA instead - is it easier to deal with?

Thanks!]]> RocketBoy87 General Sun, 29 Apr 2012 14:35:23 -0400