Anar

I couldn't find back the photos of the modified UM with the 1.75mm mechanism but it was a mechanism exacly like this. Note that you should be able to find much less expensive similar ones. But I did find some notes back that I had taken for myself and here they are: * filament diameter appears at 2 places in Cura : - Machine settings (Extruder1) - Material definition * I modified my flow down to 83% (I suggest you do your own tests) * I modified my speeds to 40mm/s (feedrate) and 150mm/s (travelrate) And I also saved 2 images of the Cura settings that I have attached here. Cheers.

Yes amitmonash you got it right. First thing to do is to change the filament pushing system for another one and then I suggest to create a new printer in Cura that you could call "Ultimaker 1.75" for example. Then you will need to edit this new printer settings to use 1.75mm instead of 2.85mm. This way it's easier to swap from one size filament to another : in Cura you use regular Ultimaker when extruding 2.85mm and then tell Cura you want to use "Ultimaker 1.75" when extruding 1.75mm. I did this hack something like 4 years ago so I don't remember exactly all the settings that have to be changed. But for sure the filament diameter of course. It shouldn't have any impact on retraction, flow rate, temperature, etc. as far as I remember. But you might have to adjust them depending on your tests. I don't have access to these modified Ultimakers anymore because they were at my old job that I quit. But I think I still have photos and modified printer profiles somewhere. If I can find them back I will come back to you. Happy hacking !

Ahoeben was right and that was my mistake. Sorry. I should have post back long time ago to say thanks and let people know that it resolved my problem (using a comma instead). Well... never too late so thanks Ahoeben ! @amitmonash : it is competely doable to use 1.75mm filament on a Ultimaker as soon as you have hacked the filament pushing mechanism. I don't know for a UM5, but I did that on a UM2 and a UM3 without problem and they both work very well now with either 1.75mm or 2.85mm filament which gives much more choice as they ate not stuck to only use 2.85mm.

Hello to everyone, I want to define a new custom FFF printer in Cura 4.8 that will use 1.75mm diameter filaments. But each time I change "Compatible material diameter" in "Machine settings" it will turn back to 2.85mm. Therefore it doesn't show me a list of 1.75mm diameter compatible filaments that I could choose from. Am I doing something wrong and could someone please point me in the right direction ? I've also done the test in Cura 4.3 and Cura 3.6 without success : same issue. Cheers.

Unfortunately the Rapman doesn't support the M92 command. Gcode for Rapman is slightly different than for other machines. But thanks for all the effort you provided at helping me !

Thanks again for your kind help Nallath ! All BfB machines aren't the same and the start code Daid is referring at is for the latest Cubex printers from 3Dsystems (they now own the BfB company which doesn't exist anymore). So it might work for them (I don't have one to check) but it doesn't for the oldest Rapman machines. For example the "magical copy right protection stuff" is un-needed for them. Believe me, I have done a LOT of tests and the only way to manage correctly the flow rate is to tweak the "Flow%". Or maybe to modify the source code in "gcodeExport.cpp" where it assumes that "All BFB machines have 4mm per RPM extrusion" which is not true. A Rapman extruder needs 3611 motor steps to push in 1mm of raw filament (3mm diameter) as mentioned in the first post.

As I think this dicussion might be endless without issue I'd like to consider it as "closed". For all Rapman owners who would like to try and use Cura I suggest you use V14.02 and just set the "Flow%" parameter at 3705 and everything will work fine. You may also have to modify a bit the start and end gcode. Just let me know if you want to know how. Thanks for all the help and best wishes for the new Cura release !

While it had one in V14.02... Then why does it export M108 Sxxx gcode lines with to little xxx ? The Sxxx is the speed of the extruder motor in RPM. And it's written down by the slicer. Good point. Couldn't it be exported in V14.02 ? (I haven't tried)

Did the test. And as expected it's worse because it generates 5D gcode which the Rapman doesn't understand. But it was worth a try...

Ivan, I have set "machine_gcode_flavor" with the value "default": "BFB". Just like it was in V14.02 for BfB machines. Ok I'm gonna try with "default": "RepRap" but I doubt it will work for my machine because BfB gcode are not 100% the same as Reprap machines. That's why there was the possibility to choose "BFB" in V14.02. But it's worth the test... I'll let you know about the result.

Hi, I've followed Ivan's instructions and managed to configure a profile/setting for my printer. But not for my nozzle... So with this new version the problem remains because I didn't find any place where I could set how many extruder motor steps are needed to fill in 1mm of raw material. Which once again is leading into wrong flow rate values (M108 ). The only thing that could do the trick is once again to use the Flow% like I did in V14.02 which is what I was trying to avoid (please read my 1st post in this topic). Other remarks : I also tried "Quillford generator" which offers much less configuration options Entering "BFB" as "machine_gcode_flavor" does nothing (at least it was producing a .bfb gcode file in V14.02) I think it was easier to make a machine profile in V14.02 because everything could be done via the GUI without having to edit a text file (.json) I don't see where I can tweak the start and end gcode via the GUI and it seems it can only be done by manually editing the .json file some gcode (M190 / M104 / M109) is inserted before "start gcode" which is not intended regarding they are not compatible with all machines (the Rapman doesn't understand M190 and M109). Especially M190 shouldn't be there when you set "machine_heated_bed" to "false" which I did. using tokens in the start and end gcode is no more possible or maybe I didn't coded them correctly (?). I've tried "M104 S{print_temperature}" which was working in V14.02. I also tried "M104 S{material_print_temperature}" but without success So in conclusion : yes you can make a profile for a new machine by manually editing a .json file but you can't make one for a different extruder mechanism leading in wrong flow rate values (same problem as in V14.02) all in all I prefered V14.02 where at least you could tweak the machine profile via the GUI I understand this is a beta version and that these points might be solved in the next official stable release. ATM I will continue to use V14.02 for the Rapman. And at least but not last, thanks Nallath and Ivan for your efforts at trying to help me. Very much appreciated ! Cheers.

OK. Thanks both Ivan and Nallath. I'm gonna give it another try following your instructions and will let you know here. Благодаря н всичко хубаво Иван! Надявам се, че ти можеш да разбираш малко български език.

Just installed Cura V15.06.03 (beta). If you don't own an UM printer there is just nothing you can do unless I missed something. Where can you enter your machine dimensions ? Where can you enter your extruder "E-steps per 1mm filament" ? Where can you enter your extruder nozzle size ? Where can you say that the center of your print bed has coordinates 0,0,0 ? Etc, etc, etc... You can't even play with the Flow% anymore ! Sorry to say, but unless I missed something this version is a "no-go" for non-UM owners. It seems that with this version Ultimaker is closing the software for non-UM owners. If it's not, can someone explain me how can one configure a non-UM printer ? Cheers !

There is little chance that BfB will invest any time or penny... they're dead! (R.I.P) Anyway thanks for taking the time to answer me. Cheers!

Thanks for the answer. I will have a look at Cura 15.06 and upwards to see if I can configure something for a Rapman printer. About the second part of your answer : it sounds strange to me that there is already non-UM machines settings regarding the fact you don't want to support them ! Meaning you don't want to support what you have included with the software default install ?. Weird !!! Even more strange when I read this from Daid Braam about Cura and BfB printers : (reference : https://groups.google.com/forum/#!topic/kisslicer-refugee-camp/AK8mDJ7h8Tc[1-25]) Where are these "guarantees from Ultimaker that Cura will support other printers" ? Best regards.

Hi all, I own a BfB Rapman 3.1 and I'm using Kisslicer to prepare my prints. But I'm also interested in other slicers and started to test Cura (V15.04). Despite it has a setting for BfB users, I found out that it doesn't work "as is" and needs some tweaking to output a correct gcode file for the Rapman printer. The most "out of range" value being the flow rate. After a lot of testing I found out that the "Flow%" value has to be set to 3705 in order to output the same flow rate as Kisslicer does (M108 ). In my point of view the "Flow%" field shouldn't be used for that purpose but it's the only trick I found to output correct flow rate for the Rapman. Under the "Machine settings" window there's an interesting field called "E-steps per 1mm filament" and thought that it might do the job but it doesn't. As a result it only inserts a "M92 Exxx" gcode line at the top of the resulting .bfb file (which is totally unusefull for the Rapman - ignored) instead of taking part in the correct flow rate calculation (M108 ) like "Flow%" does. As explained above the "Flow%" trick does the job ATM. But could it be possible to insert the correct known "E-steps per 1mm filament" in order to achieve a correct flow rate without having to change the "Flow%" to 3705 ? As I understand this value is probably internally coded per machine. By experiment I know that the Rapman extruder needs 3611 motor steps to push in 1mm of raw filament (3mm diameter). This value has been confirmed on several Rapman (repeatability). It has also been confirmed by Lonesock (Jonathan, Kisslicer's developer) when we worked together at the beginning of KS development. With this information I hope you will soon be able to provide a good "BfB Rapman" setting/profile. I would be very glad to test it and help improve it for the benefit of all the BfB Rapman owners out there. Thanks for reading.