Extrusion speed February 25, 2015 12:42PM |
Registered: 11 years ago Posts: 1,320 |
Re: Extrusion speed February 25, 2015 01:07PM |
Registered: 9 years ago Posts: 1,159 |
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jbernardis
I run with a 0.5mm nozzle, and am in the process of building a new printer for which I have already purchased 2 0.35 mm orifice J-heads.
Recently my 0.5mm J head jammed, so I temporarily switched over to the 0.35mm and I had nothing but problems with it. I assumed that all I had to change was the orifice size within slic3r and everything would work OK, but in retrospect, maybe that was a bad assumption. The ratio of the orifice openings between the two hotends is (0.175*0.175)/(0.25*0.25) = 0.49 - so the 0.5mm nozzle has twice the opening size as the 0.35. This would make me think that I'd have to halve my maximum extrusion speed. I'm thinking that by pushing it too fast that the hobbed bolt dug into the filament to the point where it lost purchase and then the filament stopped advancing
I've since moved back to the 0.5mm hotend, and everything is working OK again, but someday I'll get to the point where the 0.35mm hotends are going to have to work. I just want to know that my thinking is correct here.
Thanks
Re: Extrusion speed February 25, 2015 01:53PM |
Registered: 9 years ago Posts: 465 |
Re: Extrusion speed February 25, 2015 02:17PM |
Registered: 11 years ago Posts: 1,320 |
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dougal1957
No it isn't your extrusion speed (steps/mm) will stay the same ...
Re: Extrusion speed February 25, 2015 02:39PM |
Registered: 9 years ago Posts: 1,159 |
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jbernardis
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dougal1957
No it isn't your extrusion speed (steps/mm) will stay the same ...
I realize the steps/mm will remain the same. That's not the extrusion speed. The F parameter on the G1 statements gives the number of mm to extrude. All the steps per mm does is to convert this into steps. I'm thinking that the number that ends up on the G1 statements should be smaller because the orifice only allows half the plastic through than the original hotend. Also, I wouldn't think youd have these problems going UP in size like you did. In that scenario, you ought to be able to increase the max speed.
I think some experimentation with the temp is in order, but all increasing the torque is going to do is to grind the filament even more.
Re: Extrusion speed February 25, 2015 03:02PM |
Registered: 11 years ago Posts: 1,320 |
Re: Extrusion speed February 25, 2015 05:32PM |
Admin Registered: 17 years ago Posts: 7,879 |
Re: Extrusion speed February 25, 2015 10:21PM |
Registered: 11 years ago Posts: 1,320 |
Re: Extrusion speed February 26, 2015 07:39AM |
Admin Registered: 17 years ago Posts: 7,879 |