Mendel Skeinforge/Firmware suspected issue.

Hi,

I hope all on the forum are well.

I wonder if if would be possible for some help with firmware/software to address the follwoing problem.

The problem i am experiencing is no extruder activity when gcodes (created in SF) are sent through the reprap host. I have very little extrudate when running gcodes and have tried to follow guidance from other threads. I'm not sure if this is somtheing to do with Skeinforge or the Firmware so I have posted in both areas of the forum - Apologies if this is not the right thing to do.

setup

OS - Windows 7 64 bit
Reprap Host also 64 bit
Electronics - Gen3 (1.2 Motherboard, 2.2 Extruder Board

Extruder is an Adrians Geared Extruder with a Nema 17 Stepper motor with 200 steps rotation. This is running directly from the extruder board with no stepper driver between the extruder board and the stepper motor.

Skeinforge 41 has been used to create the g codes
The Dimension setting has been enabled
Acceleration has been turned off in the firmware
E_Steps_Per_MM has been increased to 42.9 calculated using (200*(59/11))/(7.96*Pi)

Flow/Feed rate has been set at 30mm/s

Replace.csv file have been updated as outlined below (no quotation marks are in the csv file, it just pasted in that way).
"M108 ;M108"
"M101 ;M101"
"M103 ;M103"
"M105 ;M105"

I have also included the start of the gcode for more details.

M104 S205 T0
G21
G90
G92 X0 Y0 Z20
;M108 S255
M6 T0
G0 Z0
G28
G90
G21
M113 S1.0
;M108 S30.0
;M108 S12.0
G1 X0.69 Y10.36 Z0.28 F4500.0
G1 F3000.0
G1 E2.0
G1 F4500.0
G92 E0
;M101
G1 X52.36 Y10.36 Z0.28 F720.0 E2.4168
G1 X52.36 Y0.36 E2.8845
G1 X59.64 Y0.36 E3.225

Any feedback would be appreciated.

Thanks to everyone on the forum

Raj

SF 41 is different as you can read in many other posts. I would set your E_Steps_Per_MM to about 10 times greater. Mine calcuated out at 620. I experimented it down to 460.

Thanks for the feedback.

I have been told that the G3 boards use half stepping on the extruder board so have updated my firmware e_steps to 85.8. I'll run some tests and update the thread with more details.

Thanks

Raj

On SF41 it really isn't calculated..it more a calibration. I set my speed in Repsnapper to 30 and length to 100. Then measured 100mm of filiment above the extruder. Actually make it 110 so you can see that your mark is 10mm above the extruder at the end. Then keep adjusting your e_steps_per unit until 100mm of filiment actually go through the extruder. So when you slice in Repsnapper I run an e_setps_per unit = 32 and a feed of 2000. In SF41 I run e-steps_per unit = 620 and a speed of 30. I run the gcode of SF41 through Repsnapper without changing anything in Repsnapper. By the way I am now finding that my calibrated 620 works better after all.

There's no need to keep reloading the firmware to change the steps per mm for the extruder. It's ok to enter the calculated value and then set the filament diameter to the measured value and adjust the Filament Packing Density ratio to calibrate the extruder. I think that's what that parameter is meant for.

I did exactly the same as brnrd stated and it worked perfectly.

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