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Anar

Cura for BfB Rapman

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You can use M92 for setting the steps per mm. I believe m92 e3611 should do the trick.

 

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 !

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I am having the same issue. I downloaded the latest CuraEngine code and it seems like the E-Steps per mm should affect the extruder speed unless I am not understanding this.

If you look at this code the rpm is being multiplied by extrusion_per_mm  and then exported in the M108 gcode line. But adjusting that value in the GUI has no effect. Is this just stale code?

 

void GCodeExport::writeMoveBFB(int x, int y, int z, double speed, double extrusion_mm3_per_mm){   double extrusion_per_mm = extrusion_mm3_per_mm;   if (!is_volumatric)   {       extrusion_per_mm = extrusion_mm3_per_mm / extruder_attr[current_extruder].filament_area;   }      Point gcode_pos = getGcodePos(x,y, current_extruder);      //For Bits From Bytes machines, we need to handle this completely differently. As they do not use E values but RPM values.   float fspeed = speed * 60;   float rpm = extrusion_per_mm * speed * 60;   const float mm_per_rpm = 4.0; //All BFB machines have 4mm per RPM extrusion.   rpm /= mm_per_rpm;   if (rpm > 0)   {       if (extruder_attr[current_extruder].retraction_e_amount_current)       {           if (currentSpeed != double(rpm))           {               //fprintf(f, "; %f e-per-mm %d mm-width %d mm/s\n", extrusion_per_mm, lineWidth, speed);               //fprintf(f, "M108 S%0.1f\r\n", rpm);               *output_stream << "M108 S" << std::setprecision(1) << rpm << "\r\n";               currentSpeed = double(rpm);           }           //Add M101 or M201 to enable the proper extruder.           *output_stream << "M" << int((current_extruder + 1) * 100 + 1) << "\r\n";           extruder_attr[current_extruder].retraction_e_amount_current = 0.0;       }       //Fix the speed by the actual RPM we are asking, because of rounding errors we cannot get all RPM values, but we have a lot more resolution in the feedrate value.       // (Trick copied from KISSlicer, thanks Jonathan)       fspeed *= (rpm / (roundf(rpm * 100) / 100));       //Increase the extrusion amount to calculate the amount of filament used.       Point3 diff = Point3(x,y,z) - getPosition();              current_e_value += extrusion_per_mm * diff.vSizeMM();   }

 

Edited by Guest

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Sounds like a bug.  Most authors of Cura user Marlin firmware in their printer (e.g. ultimaker printers use Marlin) and Marlin doesn't support M108 so I'm not surprised it doesn't work as intended.  Maybe one of the cura authors knows the answer.  Like @nallath (although I think he does the gui part).

Edited by Guest

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Hey Anar, I use a Rapman 3.1 and I've also downloaded and printed several of your Rapman designs on Thingiverse. Did you ever get Cura to work for the Rapman? Were the prints coming out well? I am using Kisslicer right now but would love to try out Cura if you could share with me how to edit the Flow% and any other tweaks I need to make to use it. Thanks.

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