Re: skipping extruder! September 04, 2015 11:01AM |
Registered: 8 years ago Posts: 39 |
Re: skipping extruder! September 04, 2015 01:10PM |
Registered: 9 years ago Posts: 58 |
Re: skipping extruder! September 04, 2015 03:33PM |
Registered: 8 years ago Posts: 13 |
Re: skipping extruder! September 04, 2015 05:29PM |
Registered: 9 years ago Posts: 58 |
Re: skipping extruder! September 05, 2015 12:11PM |
Registered: 8 years ago Posts: 82 |
Re: skipping extruder! September 06, 2015 09:13AM |
Registered: 8 years ago Posts: 39 |
Re: skipping extruder! September 06, 2015 12:17PM |
Registered: 8 years ago Posts: 13 |
Re: skipping extruder! September 08, 2015 09:18AM |
Registered: 9 years ago Posts: 58 |
Re: skipping extruder! September 08, 2015 09:30AM |
Registered: 8 years ago Posts: 39 |
i run 2mm also, when the printer was running it was enough for me at least! =) i just swapped the x motor for the extruder, about to do my first print in a while, i figured it was the next move to do =)Quote
Jelle
Just did two tests of [www.thingiverse.com], one with no retraction, one with 2mm retraction at 40mm/sec. Unfortunately, both succeeded...
I'll try with the 'normal' 4.5mm retraction next, it might be that 2mm is not enough to ease the pressure and actually retract filament from the hotend.
Re: skipping extruder! September 08, 2015 02:03PM |
Registered: 9 years ago Posts: 58 |
Re: skipping extruder! September 08, 2015 06:51PM |
Registered: 8 years ago Posts: 13 |
Re: skipping extruder! September 11, 2015 08:45AM |
Registered: 12 years ago Posts: 1,611 |
Re: skipping extruder! September 11, 2015 08:57AM |
Registered: 9 years ago Posts: 58 |
Re: skipping extruder! September 13, 2015 09:49PM |
Registered: 8 years ago Posts: 443 |
Re: skipping extruder! September 17, 2015 10:45AM |
Registered: 8 years ago Posts: 39 |
Re: skipping extruder! September 17, 2015 08:31PM |
Registered: 8 years ago Posts: 443 |
Re: skipping extruder! September 18, 2015 02:05AM |
Registered: 8 years ago Posts: 39 |
I'm using pronterface because i nerver got the web interface to work! In this video I am printing on slic3rs standard settings, but I have tried going down so it prints very very slow, same result! I've tested the temperature from 180 all up to 220, the same result! I've tried to switch motors, same result. I raised the Ma on the stepper motor to 1200, also didnt make a difference! I have tried pretty much all the standard things I think! It's also worth mentioning that I have used this exakt same settings to complete a 5 hour printed T-Rex skull, and some other things, this just came out of the blue!Quote
bgkdavis
Why are you using Pronterface?, the on board control functions and web interface on the Duet make Pronterface redundant, just upload your Gcode to the SD card and run it from the web interface.
From the video I estimate that your running at an extrusion rate of about 18 cc/hr, and because the skipping is infrequent I can guess it is a little beyond the limit of your extrusion capability.
In practice I only run my fisher at 0.2mm height increments and a 0.97 extrusion multiplier which means I probably only run at 18cc/hr anyway, I suspect your trying to run your machine faster than I run mine.
Without knowing your speed and height settings its hard to know if what extrusion rate you are aiming for.
You should probably try and lower your printing speed to find a speed at which the skipping stops, this will enable you to determine your current maximum deposition rate
I believe the Fisher may be capable of up to 36cc/hr, but that's not an official figure that's working backwards from the 80mm/s xy rate with a 0.4mm nozzle extruding 0.4mm high, its quite possible that its not actually possible for the fisher to work at both 80mm/s and 0.4mm step increment.
Trying to make a comparison, I know the Mendel 3 has a deposition rating of 33cc/hr with a 0.5 mm nozzle, if I was to try and run the fishers 0.4mm nozzle on the Mendel I would expect it to reduce to about 21cc/hr.... but the Mendel runs at 12V whilst the fisher at 19V, so the heater may be more efficient on the Fisher...... its very difficult to make a direct comparison
To increase your extrusion rate you need to reduce the resistance, being too close to the bed may be an issue for the first couple of layers, but if your continuously getting that kind of limit then its not being too close to the bed.
Increasing the nozzle diameter and removing blockages and obstructions would be the next step to look at.
Increasing the nozzle temperature will also help increase your throughput rate, I've a few issues with the common printers wisdom that 185C is an OK temp to print PLA at, where most filament manufactures recommend 205-235C
Another issue is the filament itself different filaments (brands and colours of the same brand) will have different thermal properties which mean the rate at which their viscosity reduces to an extrudable level will differ.
Re: skipping extruder! September 18, 2015 02:30AM |
Registered: 8 years ago Posts: 443 |
Re: skipping extruder! September 18, 2015 02:47AM |
Registered: 8 years ago Posts: 39 |
Okay, Will do! Is it the knob turning that might be helpful to se or the actual nozzle? I'm guessing the knob but, just to be safe! It's the same brand (eSun) but another color! Although I've have made some successful prints with this blue one also! I tried to swap back to the white, same results! I'll get back with another video when I get home! Currently I'm using the standard confit.g file, so it should be enough with my network settings! Although I'm thinking of using my old android phone to control it, that's also a reason I haven't been trying out the web interface! Would save soo much space, but I now have a separate pc for just printing I guess it would be nice to have the web interface to at least try!Quote
bgkdavis
Maybe you need to show a video of it printing at a much lower rate yet still skipping, slow your printing down so 1 rev of the extruder knob takes 20 seconds (its currently taking 14s )
I recall slic3r has a volumetric setting for the extrusion, try setting this to a max of 10cc/hr or even lower.
If your still having problems with your web server then post your config file and a picture of your computers network settings, getting that to work is easy
when you say exact same settings does that include exact same filament?
Re: skipping extruder! September 18, 2015 04:50AM |
Registered: 8 years ago Posts: 13 |
Re: skipping extruder! September 18, 2015 10:31PM |
Registered: 8 years ago Posts: 443 |
Re: skipping extruder! September 19, 2015 02:20AM |
Registered: 8 years ago Posts: 39 |
Quote
rogerdiver
I don't if you have been following the Bowden tube thread? Your symptoms sound just like mine. In my case the tube being properly seated in the radiator. Once figured out every now works. Below is my last remarks copied from that thread. Perhaps might help? Paul
rogerdiver [ PM ]
Re: Issues with bowden feed...
September 11, 2015 05:43AM Registered: 4 weeks ago
Posts: 7
Thank for this valuable thread and advice!
I remade the Bowden tube after getting a PCB drill. What a difference! Sharp and clean finish. I also pre-threaded the tube using a M4 nut before attempting to screw into radiator. Also carefully measured the length of thread and marked the guide filament so I knew when it was fully seated. 1/2 turn back suggested too. Shortened Bowden tube to have better 'fold' profile as effector moves up. Added cable tie to keep it upright at effector top.
And now a smooth insertion of filament. What a difference.
Now printing predictably. But only after resetting Slicer to default settings (too much filament in wrong places) !
Lesson for me - if having to keep adjusting retract feed and speed and temp I ought to understand the underlying issues.
Thank you all!
Edited 1 time(s). Last edit at 09/11/2015 10:40AM by rogerdiver.
Reply Quote Report
Re: skipping extruder! September 19, 2015 10:45AM |
Registered: 9 years ago Posts: 58 |
Quote
bgkdavis
Maybe you just have an excessively rough tube, and need to get it replaced.
[...]/quote]
That probably was the case. I dismantled the hotend and tried to look at the inside of the tube. Not very easy, but I could see the grooves I could feel with a metal wire. So I took a 2mm drill and put some Cif on the shaft end. With that in a hand drill I polished the inside of the nozzle tube (5mins) later I put some polishing compound I found in a metal workshop. At least the drill shaft came out shiny (was black oxide). After reassembling the hotend it seems to have worked! Where before I got a jam with every print longer than ~20 min, now I've had none ruin a print thus far. (I did get some trouble with bed adhesion and calibration, but that is another matter.
So yes: in my case a rough tube appears to be the culprit. I got a reply a little later from support and they will replace it anyhow.
Re: skipping extruder! September 19, 2015 10:49AM |
Registered: 8 years ago Posts: 443 |
Re: skipping extruder! September 20, 2015 04:20AM |
Registered: 8 years ago Posts: 83 |
Re: skipping extruder! September 20, 2015 10:08AM |
Registered: 9 years ago Posts: 124 |
Re: skipping extruder! September 20, 2015 10:12AM |
Registered: 9 years ago Posts: 124 |
Quote
Theolodian
In slic3r. It pulls back a few mm and slams it back forward with the same speed setting. More prevalent when moving across open spaces but also does it every layer. Mine had issues at 3,000mm/min - dropped to 2500 and much happier even though I increased the retraction distance a bit. You end up with a bulb at the end of the filament between the end of the bowden tube and where the nozzle necks down, this seems to catch if retraction is too aggressive. Pull the filament out and you will see what I mean.
Re: skipping extruder! September 20, 2015 12:17PM |
Registered: 8 years ago Posts: 475 |
Re: skipping extruder! September 20, 2015 01:00PM |
Registered: 8 years ago Posts: 155 |
Re: skipping extruder! September 20, 2015 06:32PM |
Registered: 9 years ago Posts: 58 |