mhotze

I recently switched to Cura 2.7, and am glad to see the continuous improvement of the software with regard to how it is handling dual extrusion setup. Thanks for that effort! An idea to further improve is the less intuitive (and hence error-prone) handling of temperature profiles. As I more or less tried to deduce, I think the actual temperature used is a combination of settings: Print Core & Material + Profile + Default settings These are all stored for both cores in a single setting file. So in the end this is quite cumbersome when changing material, changing cores, use settings of one profile from core 1 in core 2, or in general where to change temperature settings in the first place (e.g. Print Core & Material or Profile). My idea is to handle materials differently: - merge Print Core & Material settings with Profile settings --> make one settings profile - store these settings per core I wonder if that would simplify and improve Cura further or is this an over-simplification?

Ah, so I guess replacement screws which are longer than the original screws that are already there? Again, very nice! Easier to mount as well compared to my design. Would you be willing to share your design?

I've recently printed a very large and flat ABS part, see picture below using the winning adhesion method (see my previous post with the link): I was actually surprised to see there was no warping at all, the model stuck very well to the heat bed. After it popped off when the build plate cooled down, the model was even bending upward in the center a millimetre or so, so weirdly enough, it had some kind of inverse warping. No clue as to why this happened.

That looks cool!! I wonder how the hinges are helt in their position. Looks like sort of a clamping mechanism? Does that work well enough to keep them in position?

Could not find this in release notes of 2.5. Is it in?

I agree. I will discuss this with "the powers that be" Oohoops. For me a lesson to have a look at the release notes before upgrading. Well... I wonder if I would have noticed. It's this line I think, in retrospect right? "Initial layer printing temperature. The initial and final printing temperature settings have been fine-tuned for higher quality results." I also just found out about the +5deg change when going to Cura 2.4. I noticed considerable oozing after the first prime poop going to the brim, which I did not recall seeing before. I first thought it to be a setting issue. Double checked everything, finally had a look at the g-code, and noticed the +5 deg. Took me a day or so to figure out.

Cool! Now let's see if some hybrid of the 3 designs will pop-up Update here from my door: it's still a pleasure to work with, I did not have to adjust the prime positions or anything.

I'm aware of that and all effort on Cura appreciated. I'm tempted to help, a bit off-topic, but I wonder if Cura is 100% a community effort. I think it's hugely promoted by Ultimaker, it came with my UM3, which a paid >>3k for. I think that's the underlying reason for some frustration, but I'm open to help as well. Does Ultimaker hire on project basis ?

Just upgraded to 2.4 yesterday, and noticed this issue right away. Thanks for the workaround.

I tend to believe warping is mainly an adhesion problem, and to lesser degree a settings issue. I've compared bed adhesion methods (here) and went for the best solution, all prints came out fine since (read for about a week since my test). For both ABS and PLA. What do you use for adhesion? Bare Glass?

"Maximum Fan Speed The Speed at which the fans spin on the minimum layer time. The fan speed gradually increases between the regular fan speed and the maximum fan speed when the treshold is hit." What? Reading. Reading again. And again. Does not help much. What is Cura trying to tell me? Fans spinning on minimum layer time? Fans spin on electricity. And I guess until minimum layer time, fans spin at regular speed? Which treshold? And probably the fans go from regular to max after the treshold is reached, not at the instant some threshold is hit, and still there's something of a gradual increase, some contradiction there. Hmm. How gradual? Damn... Above rewritten: Maximum Fan Speed This setting defines the maximum fan speed. When the "Regular/Maximum fan Speed Treshold" is reached, the fan gradually increases between regular fan speed and maximum fan speed. ...and that's just an example.

...or to better understand the way to get a grip on your settings. For me also to gain some more understanding (please give feedback with more info!) and suggest improvements. I seem to have lost some carefully tuned settings and I could not get my head around the way Cura handles settings. So here's an attempt to get things clarified. At least, up until the moment some ambiguity in how settings are used is solved and things are self-explanatory. One of the ambiguous things currently is for instance that temperature profiles can be stored both in Material settings and User Profiles. Some of these in return influence other parameters which makes it quite tricky to setup your print and making you wonder what happens with your settings you thought you defined earlier. So here we go. I'm on OsX (mac), and talking Cura 2.4 now with a UM3. I guess the OS does not matter that much, but the way Cura handles profiles and settings can be more subject to change depending on the version you're using. How to figure out how settings are used in Cura One way to approach understanding the way Cura works with settings, is to have a look what is going on "under the hood". Well, yes, not that I wanted to, but that's where I ended up. To be honost, euh, also had a peek at the competitor to check how they are doing, and if that's worth the investment instead of putting time and effort in Cura. But anyways, back to settings in Cura. It looks like there are default settings, which are stored in setting files, and user settings that overwrite the default ones. All are human-readable ascii files which make it possible to see at least what is stored. With changing Cura versions and the way settings are handled, this kind of exercise can be useful to master in that sense, in order to figure out yourself how things work with future releases. So how are settings used? There are multiple setting files that influence the final settings that are used: The Default Settings: Cura has default settings, which depend on the printer used. I think the default settings are stored in the application directory: Applications/Cura.app/Contents/Resources/resources/definitions. In my case, the settings are stored in the file ultimaker3.def.json. Superimposed on this, are the standard or user defined material settings. The important settings stored are Default Printing Temperature, Build Plate Temperature, Retraction speed and Distance, Standby Temperature and Fan Speed. Now the tricky thing I've seen by now are twofold. 1) Some of these parameters influence settings like printing speeds from the default settings, at least if they are not stored explicitly in a user profile. 2) Some of the material settings can also be stored in user defined profiles. It seems to be undefined behaviour which settings are actually used in those cases to calculate settings like for instance the printing speeds. I'm not sure of if this is intended or not. Getting this ambiguity solved would be beneficial. There are also Standard or User Profiles. Since we're talking about finetuning settings, I'm skipping directly to User Defined Profiles. For OsX, they are located in your_home_folder/Library/Application Support/cura/quality. In case of a dual extrusion printer, the settings are stored in 3 different files. These are the settings which are extruder independent (the Global settings if you have a look at the Profile Manager in Cura), and for each extruder individually. The way it currently seems to work, is as if there are changes to either settings defined by the default printer settings or material settings, these are regarded as "updated", and can then be stored in the current user profile by clicking "update profile with current settings/overrides". Only these "overridden" settings are then stored in a user profile. At least, I think that's the way it's working. Let me know if there's things incorrect or missing so I can update the story above if needed. Also, for non- OsX users, it could be beneficial to inform which directories are used, for other users to have a peak to their actual settings files. The way I'm currently working is examining how my settings are stored and take some notes in a text file, and double check if the relevant parameters turn up in Cura, especially when changing filement and reverting back to settings used earlier. Note, that I've not yet found a way to delete settings in a profile (for instance to delete retraction amount in a custom profile, in order to only define them in the material profile), other than delete settings using a text editor. This helps both in de-cluttering settings and knowing what you're doing (which I hope would be solved in a future release, next of course in solving the ambiguity issue explained above). One solution could be to visualize what are default settings and what are overrides by user profiles, and what are overrides by material settings (or even ditch material settings completely and go for user profiles only).

Bump... thanks for pointing me from this post to this one, I now see with dual extrusion a collision happening when the second prime position is travelled to, the print head quite violently hits the prime poop already there. So now I wanted to have a look at changing the prime position, but I'm faced with this message: I think I need to change some setting, but as of now clueless where to change it.

That would be very interesting, a contest between adhesive sheets, kapton, and ABS juice or 3d Lac. If someone is willing to test that... or send me some samples in generous quantity

For the adventurous (use at own risk), here it is: http://catch22.eu/3dprinting/u3door/ Detailed instructions: here are some I could think of right now. Tricky part is finding the correct position to drill holes in the door itself (not too low, otherwise the extruder hits the clamps). There needs to be about 5mm play in z-direction between bottom clamps and top clamps, although the latches have slotted holes which aids well enough in drill hole accuracy I think. Best way to find the positions is to drill at least holes for the bottom and mount the bottom clamp, then find the correct position for the top clamps. The top clamps have sort of a centering mechanism, so both X and Z positions for the holes do matter. My suggestion for door material is to take something that can withstand some temperatures (mine is from 4mm polysterene, which can handle 75C, although I'd rather go a bit thicker than 4mm to give it some more rigidity). The clamps are made for M4 size screws, and ABS of course. Take also care for the remarks below/above using maximum possible build volume. Please let me know if the stl files are correct (I had to edit them for general usage by giving them the correct orientation).