gamerfanatic
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Posts posted by gamerfanatic
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I hope you get a chance to read this but there is a really obvious issue to this that tends to be the culprit.
Sometimes you can have "too good" of a level (of the bed). If your level is "too close" it is hard to push filament out of the nozzle. Especially on the initial layer. This was the issue that I was having and it turned out to be related to the bed leveling.
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Yes the build plate to close can cause this behaviour.
As you mentionned because it's too close, the feeder will have a hard time pushing the requested filament quantity.
You can fine tune the bedlevel during the print of the skirt or the brim of your print to have it perfectly leveled.
It's not a bad thing to have the first layer really squished, it will increase the bed adhesion, but you can have some small grinding on the filament which could cause underextrusion on the following layers.
It's just a matter of finding the optimal bed position
Awesome, I'm going to leave it as it is as the idea of having the filament squished into the plate sounds like a great idea, I think I got a great level.
Thanks for your continued support! Voted your previous post as the best answer!
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I wanted to update this thread as I seem to have figured out what has going on. Well I am pretty sure.
The issue of the tick is only on the first layer.
Reason, I think, is because the bed is "too" close to the nozzle which greatly reduces the flow of the filament and therefore causes the feeder to tick so it does not grind down the filament since it is harder to push through the nozzle.
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Hi,
When you say tick, you mean that you hear a sound, and that the feeder skips a step?
If yes then one cause can be a partially clogged nozzle, (look for the atomic method to clean it). Or it could also mean that your print parameters are too demanding.
Do you have any underextrusion? (you seem to say it doesn't affect the print).
If the feeder pulls the filament every now and then, it's due to retraction and that is a normal behaviour.
Its not the retraction as that pulls the filament back, as it should.
This is like a tick that seems to move maybe .25 of a millimeter so it doesn't do much in terms of "retraction" it just seems to like "reset". I read that this is due to too much pressure on the filament? Do you think Robert's feeder update will help the issue?
Thanks!
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You can always replace the belts if they are bad, but I don't think slipping would be caused by the belts being too tight. Especially after sitting for a few months.
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I'm having a similar issue but on when the feeder "ticks back" a small amount every so often. Im starting to think there is an issue with the feeder mechanism so I should print Rob's feeder which is quite popular around here.
Make sure to read everything before you take it apart, turns out you need to make a run to the hardware store for some stuff before its ready to be replaced...
https://www.youmagine.com/designs/alternative-um2-feeder-version-two
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I cant figure out why the feeder is doing this little thing where it takes back the filament and then continues on, happens every 15ish seconds or so. Really getting frustrated about it.
Prints seem to be unaffected however.
I understand that it is the extruder's attempt not to grind down the filament due to a lot of pressure. But how can I correct this pressure issue? I turned the screw on the top by the bowden tube all the way out so its not even inside the nut inside the feeder mechanism anymore and it still does it every so often.
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You have been printing to cold then and need to up your Temps.
There maybe something that causing it to click back. You may need to do an Atomic pull to clean the nozzle. I would recommend printing Roberts feeder.
But the test came out fine so try printing your earlier piece at 225 and see how it goes. Then fine tune from there.
I will print Robert's feeder. I actually like the design a lot more than the new one (more open).
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That was crazy watching. Love it. 10mm^3/sec got a little hairy but as you can see it came out alright!
What now?
I should note, the back wheel that feeds the material into the tube seemed to "back click" every so often, much more at 8+ mm^3/sec. I was only printing at 4.0mm^3/sec on the print i posted above (with fill and bridging issues)
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you definitely need to go hotter at those speeds. like 220 or 225.
I would try this speed test first. just load the Gcode onto the sd card and print it at 230deg
https://ultimaker.com/en/community/view/5586-can-your-um2-printer-achieve-10mm3-s-test-it-here
this will show up if you have a problem. if it prints fine then its your settings that you need to adjust.
Can't seem to find the download link...
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Print: http://www.thingiverse.com/thing:704409
Here's the print, I think it is definitely evident not only on the "bridging" portion but on the layer that all of it sits, on, holes ETC. (Note this was printed at 100mm/sec, but i think it is definitely doable)
Settings:
*Extruder temp: 215C*
*Bed Temp: 50C*
*Ultimaker Silver PLA*
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Quality:
Layer Height: 0.1mm
Shell: 0.8mm
Retraction: Enabled
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Fill:
Bottom/Top Thickness: 0.6mm
Fill: 33%
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Speed
Print speed: 100mm/s
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Support:
None
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Machine:
Nozzle: 0.4mm
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Quality
Initial layer: 0.3mm
Initial layer line width: 100%
Cutoff object bottom: 0mm
Dual extrusion overlap: 0.15mm
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Speed:
Travel speed: 150mm/s
Bottom layer speed: 20mm/s
Infill speed: 100mm/s
Top/bottom speed: 0mm/s (100mm/s)
Outer shell speed: 75mm/s
Inner shell speed: 0mm/s (100mm/s)
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Cool:
Minimal layer time: 5 sec
Fans: Enabled 100%
The results:
Sorry for the upside down image. Thanks Apple.
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Sounds like you have under extrusion issues over certain Speeds
Yea, I think that is definitely the issue. How would we be able to fix this?
Here's the latest print, I think it is definatel evident not only on the "bridging" portion but on the layer that all of it sits, on, holes ETC. (Note this was printed at 100mm/sec, but i think it is definitely doable)
Sorry for the upside down image. Thanks Apple.
Settings:
*Extruder temp: 215C*
*Bed Temp: 50C*
*Ultimaker Silver PLA*
---------------------
Quality:
Layer Height: 0.1mm
Shell: 0.8mm
Retraction: Enabled
---------------------
Fill:
Bottom/Top Thickness: 0.6mm
Fill: 33%
---------------------
Speed
Print speed: 100mm/s
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Support:
None
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Machine:
Nozzle: 0.4mm
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Quality
Initial layer: 0.3mm
Initial layer line width: 100%
Cutoff object bottom: 0mm
Dual extrusion overlap: 0.15mm
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Speed:
Travel speed: 150mm/s
Bottom layer speed: 20mm/s
Infill speed: 100mm/s
Top/bottom speed: 0mm/s (100mm/s)
Outer shell speed: 75mm/s
Inner shell speed: 0mm/s (100mm/s)
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Cool:
Minimal layer time: 5 sec
Fans: Enabled 100%
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It seems like anything too fast just has too little material, do I need to increase material flow?
When bridging, the first "attempt" at bridging the material fails to extrude out of the nozzle until the second sweep around but by then the "infill bridge" has no where to be placed on.
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It seems like anything too fast just has too little material, do I need to increase material flow?
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Set all speeds to 50mm/s (except initial layer) and see if it's ok, then adjust speeds from there until you get the results you want
Is there no way to correct this without adjusting speeds? I should be able to print at 80ish mm/s infill with this printer. Even on larger (square) prints it does the same type of things. I have reduced it to 60ish but it still will not finish it well.
(ultimaker 2)
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I am feeling a little more comfortable around this machine, which I am happy to say. However, I still have this issue on ANY infill I am doing. Either high percentage or low infill, it still is not making a complete infill structure like it should. Any ideas? All my infill looks like the print attatched in the OP.
(I've increased temps to 217C with same results)
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Thank you for the help all. Everything is working great now.
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Ohh, I bet a raft will help. For now I am going to print the other parts alone individually. I will go back to those small planet gears after the other parts are finished.
I'll report back in a little! Thanks for the rapid responses so far.
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Did you watch it happen? that blob on top of your bottom layer looks like it was created when you started the print - the printer prints out some filament to get things started and sometimes it kind of sticks to the nozzle and then gets dragged around with the nozzle for a while until it eventually falls off and then later maybe the head hits it again and pushes it somewhere else.
I always run over to the printer when I hear it starting and grab the initial filament and pull it - pulling extra fast as it moves to the start of the print (to make a thinner-than-thread, easily broken, safe strand).
See my posts above about the retraction speculation, I watched it happen. More photos incoming on the 3rd failed attempt. It definitely has to do with this retraction of the filament out of the nozzle to place like little dots of filament on the bed as "gears".
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It seems like it keeps getting stuck when it trys to print those little gears as it has so many "retraction" points to just put a blob of filament down for the teeth... how can I fix that?
Here is the print http://www.thingiverse.com/thing:23030
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Not too sure why the printer is doing this, it seems like the printer keeps printing parts that are raising off the bed, or like printing excessive material and it seems to slip up like in the picture below.
Any ideas on what is going on?
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Yes it can handle it. but its the difference in speed that's a problem. the faster you go the hotter the nozzle temp needs to be. So you will need to increase the temp. this will fix the infill but make the slower areas a bit hot.
+rep if I could! Thank you!
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HI
In Cura you need to go to expert, full settings, then go to the advanced tab and you will see infill speed. Slow this down. 10mm/s (or close to it) above the print speed is good. to fast and you get problems like yours.
you can even out all the speeds so they don't vary to much between each other.
Example:
50mm/s outer shell
55mm/s inner shell
60mm/s infill
50mm/s top bottom
This is what I thought I would be able to do. Is there no other way to compensate for more flow? After exploring the settings the speed only seemed to be around 100ish mm/s so the printer should definitely be able to handle that, no?
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Hey guys, this is my first issue with my new 3d printer! I love it anyway :Pbut wish to figure out what I need to adjust to get it working even better!
The infill does not seem to be "connecting" see pictures below for the issue. It seems like the printhead is moving REALLY fast during the infill parts so the "flow" seems to be too slow to keep up with the fast print head? Not sure!
(20 or 25% infill)
Anything I should adjust?
Thanks!!
Aaron
Heatsink fan stays on 24/7 (Not an issue but a... request?) :D
in UltiMaker 3D printers
Posted
First off, I know the fan is hard wired to turn on the second the machine is on. However, is there some way to "fix" this? A controller or something to solve this? I though I read somewhere that when the extruder goes above 40C the fan will turn on, don't recall how to get this but... Yea.
Thanks!