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@SandervG I would be quite interested in papers describing how you create your print/material profiles for TPU, PLA and ABS if you can find any. Also it would be really interesting to know how you tested your geared feeder before release

@Marco_TvM Thanks for the information! Please keep us posted. I understand that things do take time to be done right. As Ultimaker has had already over a year I just would have hoped that you were further in discussion regarding this topic.

I have to disagree. In the case of one person operating the printers you may be right, but in the case of multiple users and printers it gets tricky. I think in a lot of cases a simple end stop is enough. Blocked nozzle, filament grinding and filament problems can be solved by using the right profiles,quality filament and the right filament. Another option would be to save the length on the filament rfid chip and reduce it after printing/every stepper move . What if you would guide us ? Couldn't you transfer the main shematics of the ultimaker filament sensor?

Not a native english speaker therefore my wording may have been not the best. From the outside it sounds like people are divided regarding releasing files otherwise it would have been done already. Yes I only heared and read good things about you ;-) Yes you are right, but I can't use the UM2 to precisely tune filaments for the UM3 for example (Print core behaves different then Olsson block) . The firmware of the UM2+ may be easier but the Atmega 1280 hasn't really got much room for experiments. (Pressure Advance or S-Shape acceleration). The UM2 hasn't got rgb leds in the printhead to color quote what it's doing. (Heating up being at idle temperature cooling down) Are all the files I need stored in the griffin folder or do I need to look somewhere else? I didn't say that the UM3 has such a problem. I only said that two of three UM2 machines show burn in and those screens ain't no cheap. What's the best place to post ideas and bugs/annoying behavior? This forum?

Thank you @Daid for the detailed answer even though the answer is not what I would have liked to hear! I’m quite happy to hear that there are still people like you (and probably more) at Ultimaker who believe in open source. It’s sad to hear that people who have a big say don’t believe in it that much. I think for university’s it’s quite important that the printer is open source. I just recently visited an institute at my university and they said the printer they bought is really good and useful, but they can’t do all the research due to it being a closed system. The Tinker firmware is actually a good example IMHO. The engineers and tinkeres created their own firmware and Ultimaker therefore can serve this category as well. A bit off topic: At my local Makerspace we are going to switch to Tinker firmware soonish. Mainly because of the screen sleep feature, which I would love to see merged by ultimaker, as our oled screens do show some burn in after 1000+ hours of prints. Regarding patches I believe the most important thing is the documentation. A good documentation eases the start. The harder it is to start the fewer people will help or have the time to help. Problem is probably that writing such a documentation takes a good amount of time which could be used for new features. I got to admit that I’m not a programmer by trade. I’m a mechatronics student. We for sure do some programming, but not all the time and studying can be time intensive from time to time :/ Therefore I can’t for sure say that I would send pull request for patches if the source code was open. Is there an easy ssh command to pull all the Ultimaker python files from the printer? As you mentioned the open source decision won’t be made in the near future but maybe some of the following ideas for community involvement can be made. an open bug list to allow us to see that you know about the problem and possibly work on a fix some specific place which gets visited by the developers to talk about user interface improvements and new features. Currently I think the ideas do get lost in this forum.

May I ask you mean by bumpouts? What the cause of such besides speed? I think @gr5 means wall thickness set to 1.6mm and line width set to 0.8mm. If you use those names they should be found by the search command

DDG stands for Dual Drive Gears and it's the quickest to install feeder upgrade for the Ultimaker as far as I have seen. (*Please correct me if you have seen a quicker feeder upgrade for the Ultimaker.) This is due to the new design, which Martin (Bondtech) and I came up with. As @gr5 already said the shape is based on the supplied Ultimaker feeder to reduce part count which also reduces the upgrade price and also being a bit eco friendly (using the parts on hand instead of replacing good components with new ones and creating "waste"). You are probably familiar with the QR ( Quick Release), which works just as well but is a bit more complicated to install. Not complaining It's just an "ugly" fix/hack IMHO, but as already said there are a lot of ways to get to Rome. Do you need oil with the 3dsolex tubing or is it not slippery enough? @SandervG I assume Ultimaker has done a lot of test with flexible TPU material. Any research papers you can share? Does Ultimaker internally also use the oil method to print flexible filament reliable ?

@alex jaspers Happy printing! I would also suggest to check out Polysupport or the new Breakaway filament by Ultimaker. I actually prefer Polysupport over PVA for most objects. I haven't tried breakaway by ultimaker, but it should work the same I think. @neotko Thanks for all the information. They are quite in line with my thoughts on the printer (only saw it at different 3d printer shows). Looking forward to see more of your findings/exploration with the bcn on twitter @SandervG I don't mind to hear your 2 cents. I actually find it really interesting and I think it could be of some help for people researching. I always appreciated the open and objective discussions on this forum about 3d printers. ( I have been a silent reader for a couple of years)

You are right! There are different roads leading to Rome My personal preference is to reduce involved parts and not to add something, which could lead to problems in the long run. Oil related problems are also quite hard to trouble shoot later on I also don't like the fact to re apply oil every X meters. What if I forget it and ruin a long print? I actually started to design the Bondtech DDG to make it easier to use Bondtech dual drive gears on an Ultimaker. It's really quite easy. @SandervG I think I may be able to convince Martin to send you one unit for review if you like. Don't you want to reduce the friction in order to stop the filament from buckling up? Therefore I think they are actually somewhat related. Anyway most important thing is that @chuckmcgee was/is able to print his parts with a flexible filament! Did you have success ?

I quite like my Ultimaker 3, but I also think there is still some space to improve some things and I believe the hardware foundation is good and improvements can be done by software. Sadly the firmware of the Ultimaker isn't open source right now and the community/users can't (it's quite difficult) actively help to find and solve bugs or add new functionality or improve the user interface. Yes there are a few developers on this forum, which are happy to help and guide you to some files on the UM3 to change some settings. This is really kind of them, but I don't believe it's the right way as information gets scattered on the forum and the users rely on the UM staff/devs for information. At the release of the UM3 it was said that the files will be published after a year. The files for the machine were published but the firmware source code wasn't. From time to time I read that the firmware will be published at some point but no specifics are made and it seems like the date is pushed back and back. Therefore I wanted to ask Ultimaker if the firmware will be published at some point? Whats keeping Ultimaker from publishing it? Hasn't Ultimaker profited from publishing the source code and working together with the community/ users? Cheers!

I think especially in this case it is important to have a 'Cancel' option, which will properly cancel the loading procedure. Otherwise you provoke a power cycle :/ Fun fact I didn't really bother me until yesterday as I was talking about it with a colleague. We were talking about how to display what print core combination is loaded (AA/BB; BB/AA; AA/AA) so everyone can quickly see which filament can be loaded. Use case: A BB core is loaded and you don't notice it while loading PLA for example. You are forced to complete the whole loading procedure and do it again. Yes you don't need to insert filament, but it still takes time and nobody really likes to spend more time than necessary. My suggestion would be to include a cancel button as well as a print core change button.

Because Linear advance, JKN advance or pressure advance (however you want to call it) will improve especially the corners of your printed objects. Have a look/read here: JKN advance documentation or https://translate.google.com/translate?sl=auto&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Fwww.dr-henschke.de%2Fadvance.html&edit-text=&act=url I remember seeing pictures of bad corners in another thread. You can for sure go without but if you are looking for perfection you probably want to use it. I don't think the UM2 series will get such an update but maybe the UM3 ( )

Happy printing !

You can load the G-code file on your printers SD card and start it from the print menu on the printer. It will tell you that the file isn't meant for the machine as it misses the machine specific presets. Press ignore and print and your e-steps should be set for the Bondtech DDG. Pushing four times as much sounds really odd May I ask what happens when you load your filament? If it pushes four times as much filament you shouldn't be able to load filament without problems. Do you mind checking your Ultimaker Cura installation just to make sure this isn't the problem. Do you currently run UM firmware or the linked UM firmware with the Bondtech DDG settings?

Hi @Hertz, really happy to hear that you like your new Bondtech DDG Let's try to fix your firmware issue. I assume you own an Ultimaker 2+ or extended+. Did you remember to do the factory reset after you uploaded Tinkerware? It's actually quite important as you may end up with wrong values otherwise. If you don't want to upload new firmware to your printer you could also just start the following g-code file to overwrite the old e-steps: steps-bondtech.gcode Hope this helps and fixes your problem!

For the moment you can hopefully solve your problem with the test firmware 4.2.4.20121222 , which should fix the instability. See also: Print head thermal stability or not

@tomnagel @Daid Correct, thats bed leveling. Thinking about it,the behaviour makes sense. I believe I have seen the same graph not related to bed leveling, but I wouldn't bed my UM3 on it ;D @Daid Any kind of timeframe for the full solution and the release of a new firmware? I ask because the update from 3.7 to 4.0 took quite a long time ( 6 month ?! ) How stable/safe is the test version? May I ask you to look at the temperature graph below? I marked the ER15 spot. It happens on 3 UM3 running the firmware version 4. The printer is configured to print PLA and Breakaway. The fourth printer, which runs firmware 3.7 doesn't have the problem. It happens on print slot 2. It's not the fault of the print core as swapping in a new one or swapping print core 1 and 2 doesn't solve the problem. I measured all my print cores and they are all about 28 Ohms, which to other information published is out of spec. 3+ bad print cores seems to be very unlikely as I think Ultimaker has good QC. I would also like to mention that I don't like the programmed error behaviour of the UM3. Behaviour: Everything stops and the UM3 can only be recovered by a power cycle and the print is basically fused to the nozzle because the bed didn't go down a few millimeters. Do you want me to open a new topic for the error as it may not be related to the problem?

Thank you UM team and especially @Daid for responding this quickly to this problem and working on a fix I installed the new test firmware version and observed a few things: The first problem seems to be fixed, but there still seems to be a mixup between print core 1 and 2: Do you mind also looking into the start sequence temperature control, as to my observations the heat bed seems to be prioritized leading to huge temperature swings of the print cores at the start and eventually to an ER15.

Thank you @Msuurmond for linking the topic @KindaichiShota I think your/my problem is partially fixed in the new test firmware version 4.1.20171222

I imagine grabbing the blob with tweezers on a dual filament print to get annoying really fast Hopefully you/we are lucky and the UM dev's are going to help you in this regard. I think it would be best, if you do not mind, to upload a short video to make analyzing the problem easier. @robinmdh didn't you implement the priming sequence on the UM3?

Reliable dual extrusion in the prosumer space is quite rare at the moment and not as plug and play as the marketing guys want you to believe. I like my UM3 but also quite like the BCN Sigma R17. I think the IDEX system is quite clever and has some advantages over the retractable nozzle approach. The BCN Sigma can also be modified to personal requirements. The UM3 sadly is quite closed in this regard at the moment. @neotko : As a professional owner of both machines, which one would you choose? Regarding the raise3d: I don't think you can do bigger dual prints without bleeding of filament. The print volume is great and the machine, from what I heard, is really reliable. I wonder if you really need a dual filament system? A lot can be done with just one nozzle and single nozzle prints are also quite a good amount faster.

@upatamby it is controlled by a mix of ultimaker cura settings and firmware configurations as far as I know. See: https://community.ultimaker.com/topic/17772-is-anyone-else-having-issues-with-the-initial-knead-of-material-being-pulled-into-the-print/ Personally I would prefer a simple line like everyone (prusa, makerbot) does to prime the nozzle as I had some problems at the start too. It's just once in a while now. If you don't want the prime blob you can disable it in cura. Search for: "Enable Prime Blob". If disabled I recommend to use a few skirt line or a bigger brim to prime the nozzle. Maybe Ultimaker will change or add more options for priming in the future but this can take a while due to varios reasons. My idea would be a tap under system called advanced -> priming strategy -> prime blob, prime line, maybe even something else.

@3dp4me The front panel of the UM3 is part 1946-J

Yes you are correct. The article is discussing the use of oil in a slightly different scenario, but if you use a few drops in the tube it will end up in the nozzle at some point. I really don't think the tubing is the problem. From my experience flexible filament is easier to push through the tubing compared to normal PLA especially at 2.85mm diameter. Best way to test this is to remove the tubing from the printer and pushing a piece of filament through the tube by hand. Other reasons I'm against using oil is the fact that it can affect your build plate adhesion as well as inter layer adhesion for example.

@chuckmcgee Please don't use oil! (Have a look at: " Friend's don't let friends use oil... " for reasons to not use oil) Oil shouldn't be necessary to print flexible filament. Your filament (92A according to matterhackers) is more flexible compared to Ultimakers (95A) TPU filament but not by much. If you wan't to print flexible filament, a well constraint filament path is needed. Otherwise the filament will buckle up. The filament path of the UM stock feeder isn't well constraint and can cause issues. There may be some printable add on by the community to help print flexible filament. With the Bondtech DDG installed on my UM3 I can print UM TPU 95A at 40-50mm/s with no problems without using oil or anything else to help. Youtube video of Bondtech QR printing flexible filament Disclaimer: I'm one of the designers of the Bondtech DDG