After 2 layers the extruder stops. i hear the feader clicking.
The filament clogs up before the nozzle.
I unscrewed the nozzle, pushed true the filament that was 2,24mm.
Cleaned the nozzle with cleaner filament.
Reloaded the filament, printed a small item to test everything was ok.
Tryed again with the fan duct. with again the same problem.
contours ok
first layer filled ok.
Second layer filled ok
halfway in the 3th layer no more filament comming true the nozzle. i hear the feeder clicking.
I use standard settings
What is the base of this problem?
How can i solve this?
I had the same issue when printing large parts. It turned out to be the socket screw in the feeder wheel that keep getting loose. Try give it some locktight.
I had similar issues - again the grub screw in the feeder wheel. I reapplied it with locktite and the quality of my prints went up a huge amount. I was struggling with larger prints and gaps in the walls on smaller prints.
Saying that, I’ve just printed my 4th part and it’s clogged after 80% of a 5 hour print. PLA is at 190. I did try upping the print speed in Simply3D, so I don’t know if the retraction speed was too much.
In my opinion the fan duct from thingiverse is faulty by design. You should not direct air flow to the nozzle, but to the isolator. What happens now is that the exterior of the nozzle gets cooled, so heater tries to compensate by heating as much as possible, thereby overheating the isolator which causes the filament to melt too early and block the pfte tube.
For well controlled extrusion there should be a good temperature barrier between isolator and nozzle. In short: nozzle should be hot, isolator should be cold. A new fan duct design is feasible in my opinion.
Even with the test outline you hear the feeder allready clicking. I don’t hear this on the other items i print.
If i stop the print at that stage, unload filament and load filament again,
I can restart printing other itmes.
If i wait until it starts to print the bottom layer, i have to take out the nozzle…
i allready changed the nozzles from left to right and back. no improvement.
I can see that you are quit new in this forum. You mentioned a statement, that you are using standard settings.
So with the standard settings I am thinking of a feed rate of 100% (or 1) in the slicers.
If you took the original Vellemann firmware this will cause a problem because it contains several bugs. The most important failure is the wrong preset of the feed factor: you have to use around 75% of feedrate to compensate this bug.
So beside the weakness of the thermal control be careful with the retraction: even small retractions caused several troubles with clogged filament; more often in the Isolater than in the nozzle itself.
[quote=“hoh61”]I can see that you are quit new in this forum. You mentioned a statement, that you are using standard settings.
So with the standard settings I am thinking of a feed rate of 100% (or 1) in the slicers.
If you took the original Vellemann firmware this will cause a problem because it contains several bugs. The most important failure is the wrong preset of the feed factor: you have to use around 75% of feedrate to compensate this bug.
So beside the weakness of the thermal control be careful with the retraction: even small retractions caused several troubles with clogged filament; more often in the Isolater than in the nozzle itself.[/quote]
Yes, i’m new on this form.
i’m also new on 3dprinting.
If you can, install a temperature sensor tightly bound to the heater block and check the difference versus the reported temperature. It is likely that the block is either not heating enough and the filament will not melt, or heating too much and the filament will melt and clog within the guide tube
I had exactly the same problem that I solved this way:http://goo.gl/6hgKBL
The parameter I mentioned is the flow, showing in the filament screen.
In your screen-shots you have a value of 90, without firmware-modifications you need a value around 75 to 80, depending on your print settings and fine tunings.
However, I would strongly recommend a correction of the firmware before you do lot of prints.
You may check the impact by yourself: unload the filament and remove the PTFE tube from the feeder. Push the filament back in the feeder an let it look out at the top. Then mark the filament and do a manual extraction of e.g. 5cm.
Measure the length which was really pushed, and then imagine what will happen with this excess material when you are printing…
[quote=“hoh61”]The parameter I mentioned is the flow, showing in the filament screen.
In your screen-shots you have a value of 90, without firmware-modifications you need a value around 75 to 80, depending on your print settings and fine tunings.
However, I would strongly recommend a correction of the firmware before you do lot of prints.
You may check the impact by yourself: unload the filament and remove the PTFE tube from the feeder. Push the filament back in the feeder an let it look out at the top. Then mark the filament and do a manual extraction of e.g. 5cm.
Measure the length which was really pushed, and then imagine what will happen with this excess material when you are printing…[/quote]
I did this, i asked 100mm and got 134.34mm.
How can i correct this?
you may use my firmware modification covering the mentioned modifications + several improvements. Its verified/running for two nozzles printer: http://ddd.k8400.hoehnemann.net/index.html (can be used with Arduino IDE 1.6 too) This is a project under development, some code modifications and enhancements are still pending.
It’s just a topic how deep you would like to dig into the software/firmware-programming
