Link
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Posts posted by Link
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Yes, I have seen the bondtech PTFE, from what I have read Ultimaker used to use PTFE then changed due to the new material as it was better heat resistance. I am in two minds with is the better choice and haven’t managed to find a definitive answer.
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Thanks for looking, I can’t work it out, I designed a test peice, a simple cross symbol with the same dimensions and all the legs print fine, no gaps, so it’s not a mechanical issue, I checked all the belts etc and gave them a tightness tweak for good measure. I also tried printing two of the problematic model at the same time, one in the default orientation and one at 90 decrease, in this scenario they are both fine !, so I thought maybe it’s due to the retraction from traversing between models somehow reduces the inderextrusion after layer change, so I enabled retract at layer change, and that didn’t fix it !. I have no idea, in one orientation on just that model it seems to under extrude right after the layer change. Print another model or rotate through 90 deg or print two models then it’s fine ?.
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the two parts just rotated by 90
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thanks !, just tried wall compensation disabled and it didn't make any difference, I am printing with a 0.6 nozzle, 0.35 layer hight. 0.6 line width.
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@smartavionics hoping you can help here again ?
this model, if printed in this orientation prints with the inner walls are not bonded together and have a small gap just along the area highlighted here
The area shown is just 4 line widths wide
on this horizontal area the two inner walls don't bond together leave a small gap, however if I rotate the whole model by 90 deg the gaps is gone and interestingly I don't get a gap on the other parts which are now in the horizontal plane. I have tried the obvious things, up the temp, reduce fan (as I thought it might be the fan orientation), also increased the wall over lap percentage to 25%, nothing made any difference, apart from rotating the model by 90 deg and then everything is fine !. I cant work out what might be happening, I know you are an expert with this stuff, so hopefully have some ideas. I haven't don't anything with the compensate all overlaps which I think you said wasn't working well, but for now I left that alone as it sounds like it should help ?.
Its a odd one, as simply rotating the part fixes it.
Many thanks !
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@smartavionics did these fixes make it into 3.5 ?, I cannot see the fixes in the release notes ?
thanks
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is there any advantage to using either, regardless of price ?
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ok many thanks, I look forward to getting this firmware, the grinding every time you change filament will be a welcome fix ?
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What are people using when the standard Bowden tube needs replacing ?, I find after a while the collect at the extruder cannot grip the tube so either needs replacing or trimming. The UM tube is quite expensive for what it is, has anyone found an upgraded version (with less friction) for example. Is the standard tube PTFE, not sure it is ?.
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On 8/23/2018 at 9:32 PM, CarloK said:
The specific situation as reported in that issue has been solved by the 3 already mentioned fixes to filament position at the end of a print. However, I haven't closed the ticket yet since I found another problem: when you pause a print and then abort, the filament is retracted too far.
This problem is giving me headaches... I've looked at it for a whole day and then had to work on other projects again. It still has my attention but I don't get a lot of time to support the UM2. Right now I'm thinking about creating a release with all above fixes so you people at least get several improvements. And, ... it is open source. Everybody can look into the program and contribute improvements...
Hi @CarloK any news when a release might be coming out with these firmware fixes ?
Many thanks
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Yes it’s a real shame. I contacted EUMAKERS and they said the roughness was by design and to help extruder traction. But I won’t be using it, as an experiment I removed my Bowden tube and pushed the EUMAKERS PLA through the Bowden and it took way way more force than regular PLA. Def not something I would want over the longer term. As mentioned it’s a shame as the colour choice is really good. Also their spoils are a small diameter so the inner most winds of filament gave to be stretched loads to be straightened out when entering the extruder.
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Agreed, I like the colours but won’t be buying more, it’s v rough for running through the Bowden and as you say it’s brittle and tend around snap as it comes so tightly wound on a small diameter spool
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Just now, CarloK said:
My intention is to have the current state included with the upcoming Cura 3.5 beta release. Otherwise we'll post a download link here on the forum.
many thanks, appreciate your time
I was worried about the tinker firmware missing some of the parts from the official firmware and somehow affecting performance of the print or worse still causing a crash etc. I can't quantify how the tinker changes are made, maybe its not possible for it to affect print quality as its only in the UI side ?
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3 minutes ago, CarloK said:
The specific situation as reported in that issue has been solved by the 3 already mentioned fixes to filament position at the end of a print. However, I haven't closed the ticket yet since I found another problem: when you pause a print and then abort, the filament is retracted too far.
This problem is giving me headaches... I've looked at it for a whole day and then had to work on other projects again. It still has my attention but I don't get a lot of time to support the UM2. Right now I'm thinking about creating a release with all above fixes so you people at least get several improvements. And, ... it is open source. Everybody can look into the program and contribute improvements...
thanks for the update, appreciate you guys have lots to do.
Will the firmware update be made with the next release of Cura or can you/do you release firmware on its own ?
thanks
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10 minutes ago, CarloK said:
I guess you mean the bug reported here. That bug created a blob at the end of a print and only happened with Cura v3.2.
This wasn't mentioned in my list of fixes but is there as well and was fixed in Cura 3.3 too.
There is also another fix for the quickstop function where the position of the e-axis was set wrong. This is a 3rd fix to the filament position at the end of a print. Submitted by Tinkergnome.
What about the one mentioned relating to the material change ?, is this one fixed ?
At GitHub there is for the UM2+ only 1 reported issue:
- A problem with filament grinding after material change.
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No, that was a different issue, that was blobs at the end of the print, when the print finished the extruder just kept pushing material due to the length of the gcode at the end.
This is different and is when you change material, rhe extruder pushes filament before it retracts and that initial push is so hard it grinds filament.
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Also, could we get some more information on the screen whilst a print is running, like the tinker firmware. I am always nervous about installing 3rd party FW so an official UM version with nozzle temp, build plate temp etc would be great !
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I was going to mention this
At GitHub there is for the UM2+ only 1 reported issue:
- A problem with filament grinding after material change.
has this one been fixed as it’s not listed in the list of fixes in the next release ?
thanks
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Has anyone tried the EUMAKERS PLA ?, I got a roll to try and it prints really well. Only concern is it is has a rough surface to it, a bit like wood fill filament. I don’t think it the long term it will be great for the Bowden tube as it def has more friction in that compared to normal other brands PLA. They have an amazing choice of colours and finishes too
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ok, so if your wall in your model is 1mm thick for example and you set the number if walls to 1 in Cura and your line width in Cura is 0.4, Cura will use one wall and then use infill to build the rest of the wall. If you set 2 walls in Cura, it will use 2 x 0.4 which is 0.8, then use infil to make the wall to 1mm. Cura will not modify the stl, it will just print it using the parameters you define.
What Cura means by wall is a line which is on the outside of the print, the actual wall of your model can be made up of what Cura calls a wall and what Cura calls infill. This depends on how thick you design you wall in your model.
it is always best to design a model which is a multiple of your line width, for example if you have a line width in Cura of 0.4 a wall of 04, 0.8, 1.2, 1.6 etc will make it easier for Cura to use exact numbers of walls to make up your desired wall thickness. If you set wall in your model of 1 for example, Cura will slice it but it handles walls with a thickness of a multiple of line width much easier
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To clarify further, this is a wall exactly 5 lines wide, again the mess in the middle
this is 6 lines wide, and the walls are correctly made up of inner and outer walls
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I have conducted some experiments with walls exactly 3 and 4 line widths wide, and Cura does not seem to handle 3 lines wide correctly.
this is a wall exactly 3 lines wide, it seems to use infil rather than inner walls on the inside. you can also see some mess/fillining in the corner of the (yellow) infil part.
this is a wall of exactly 4 lines wide, see the inner is now made of actually inner walls and not from infil
I have actually always been setting my walls to even numbers multiple of line width, just didn't realise ! haha, I had been looking at the layer view and seen when setting the width to 3x line, it would mess around with infil and for some reason not use a correct line width. @smartavionics will be best place to explain why this is, but he is right that odd numbers of line width (even if they fit exactly) do not work correctly. !
Replacement Bowden Tube ??
in Third party products & modifications
Posted
Interesting, as the main complaint I have with the PFA is after a while the collet in the extruder stops holding the tube as well as you get movement. You can trim the tube slightly to reseat the collet but it’s a pain. Obviously it just wears a bit over time as the tube is pushed and pulled during retractions. I wonder if the PTFE is more resistant/less prone to this ??.
One thing that should help is a upcoming update to be 2/2+ firmware to stop the extruder pushing filament hard into the hot end whenever a material change takes place. This will clearly stretch the tube/collet as it pushes so hard it grinds the filament a bit.