software melting extruder

Afternoon everyone!

I'm finally ready to print! I have figured out how to take apart, cleaned reassemble my extruder (out of necessity). I am using ReplicatorG to control my machine, but I am having a software problem.

During the initial stage of the print, the nozzle is driven away from center and sits still for some time -presumably to heat up to operating temperature. However, it seemed to take too long, and I noticed plastic leakage where there should not be any plastic at all. I aborted the build and saw that the nozzle temperature was 218, well above the necessary 180. It seems that this overheating is melting my extruder into broken-ness. During the overly long heat up period, replicatorG is reporting CRC errors.

I tried checking options in skeinforge but I did not see anything that would obviously relate o this issue. Any ideas as to what is causing the initial overheating?

Can you post the GCode you were trying to print. It might indicate what was going wrong. What version of electronics are you using? I've had problems in the past with Skeinforge inserting GCode's that aren't necessary for my stepper based extruder and it causes things to pause.

Regards,

James
--
Check out my 3D Printing Adventures

This is the exported GCode that we were running.

We're using gen3 electronics.

-c2tb34's friend

This does not look like gcode to me.

the gcode is a text file (or at least all of mine is) and this seems to be a binary file...

s3g is a binary gcode generated by ReplicatorG.
I don't know if an s3g to gcode convertor exists or not, in any case I can't read it!

---

Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

hmm.. interesting - G3 reads binary g code?

Is there a switch for this when compiling the firmware or am I totally misunderstanding how it works?

I thought the gcode was sent as cleartext to the motherboard

eg G1 X1.5 Y16 F3000

It is, then AFAIK the MakerBot firmware saves as .s3g to the SD card.

---

Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

Here is the .txt file for the gcode.

Your start.gcode is setting the extruder temperatur to 220 degrees Celcius:

G21 (set units to mm)
G90 (set positioning to absolute)
G92 X0 Y0 Z0 (set origin to current position)
M108 S255 (set extruder speed to maximum)
M104 S220 T0 (set extruder temperature)
M109 S120 T0 (set heated-build-platform temperature)
G1 X-54.0 Y-30.0 Z6.0 F3300.0 (move to waiting position)
M6 T0 (wait for tool to heat up)
G04 P85000 (Wait t/1000 seconds)
M101 (Extruder on, forward)
G04 P6500 (Wait t/1000 seconds)
M103 (Extruder off)
G1 X-54.0 Y-30.0 Z6.0 F2000.0
G1 X-54.0 Y-12.5 Z6.0 F2000.0
G1 X-54.0 Y4.0 Z6.0 F2000.0
G1 X-30.0 Y30.0 Z6.0 F3300.0 (move to initial position)
G1 Z0.0 F3300.0 (Go back down)
M101 (start extruder, fwd)
G1 X0.0 Y0.0 Z0.0 F2400.0 (move to origin)
G90
G21
M103
M105
;M113 S1.0
M108 S220.0
M104 S180.0
M108 S220.0

Later it is set to 180 degrees Celcius.
I'm afraid I don't use ReplicatorG so I can't say much about the CRC errors.

---

Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse