Massive problems using RepRap Flavor

[wemarch 0]

Hi there,

we face the following problem here: in order to set the printing temperature in Cura we had to choose the RepRap G-Code flavour in the machine settings, which we thought should be no problem.

But it shows that this leads to a way too fast feeding speed. This means massive underextrusion and even "cutting" of the filament by the extruder motor.

It took a while until we found out, that this was because of the flavour settings, but with UltiGCode it works fine! Same problem using Slic3r because there is no "UltiGCode".

Does anybody else encounter that problem?

P.S.: We'd like to set the temperature (nozzle) in Cura because we do some testing with the yield strength at different printing temperatures.

 

[gr5 2,189]

When you switch to "rep rap" mode several settings in Cura suddenly appear:

Nozzle Temp

Bed Temp

Filament Diameter

Retraction distance

Retraction speed

I suspect the "filament diameter" setting is wrong. It should normally be 2.85. I'm printing on a UM2 as we speak in reprap mode and it works fine for me.

 

[wemarch 0]

Actually the filament diameter was set to 2.9 (mean value of 10 measurements).

Which reprap mode do you use?

 

[gr5 2,189]

Which reprap mode do you use?

 

*not* volumetric. Some printers evidently move the filament by volume but Marlin expects filament movements in mm, not mm^3.

 

[Dim3nsioneer 557]

*not* volumetric. Some printers evidently move the filament by volume but Marlin expects filament movements in mm, not mm^3.

 

Except if you use the M200 commands to specify the proper filament diameter. Then Marlin expects the filament amount in mm^3. But it should only used together with the firmware retraction as you might get some mess otherwise.

 

[wemarch 0]

*not* volumetric. Some printers evidently move the filament by volume but Marlin expects filament movements in mm, not mm^3.

 

Thank you very much, that seems to be the sticking point. We used volumetric alle the time. I assume Marlin interpreted mm^3 as mm...

Four weeks of error search just came to an end :-P . Thank you a lot!

P.S.: This is why I used volumetric: http://umforum.ultimaker.com/index.php?/topic/6025-um-2-temperature/?p=60436

 

[gr5 2,189]

I added a note to that posting you link to. I think Eldrick has a UMO only so although he's pretty smart and usually gives good advice I think he goofed on that one [oh wait a correction to my correction - evidently volumetric is fine if you add an M200 command]. I had read his comment before and didn't notice the "volumetric" issue and even if I had I'm not sure I would have known that he was wrong at the time. But I have been using reprap mode quite a bit this week for a stretchlet project. I'm hoping to print 500 stretchlets.