1 Topic by adam.scho

  • adam.scho
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  • Registered: 2013-06-10
  • Posts: 42

Topic: Start gcode problems

So the order that my prints happen in go as follows:
Hit "run job"
Z axis homes and extruder moves to the center of the platform right up against the glass
Sits like this until temperatures have stabilized
Starts print

When the extruder sits on the glass it oozes and causes a chunk of plastic to get stuck in the middle of the build platform so I have to wait around until it starts and scrape off this little glob before the skirt finishes so that it doesn't cause problems with my print. What I want is for the extruder and bed to warm up and stabilize their temperatures away from each other so that I can leave it alone and not have to worry about scraping this little glob up before it starts printing. I want the extruder to move directly from its home and begin printing. I don't feel very confident making my own gcode and I've seen a mention of a better starting gcode before but I couldn't find it with several searches. Can someone give me some better starting code or point me in the direction of somewhere that I can learn to do it confidently myself? Does anyone know why this is the default start code? Is there some advantage that I'm missing?

2 Reply by Hazer

  • Hazer
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  • Registered: 2013-07-19
  • Posts: 478

Re: Start gcode problems

I warm up my glass for 10 minutes after reaching temperature (remember, sensor is on heatpad, not on the surface of your glass). Then I press "run job".

My gcode:
-home all axis
-goto far right corner (x180, Y180) (its in the same corner it homes to, just over the glass)
-set extruder temperature and wait
-start print

If the bed is at temperature first, the blob that seeps out of the nozzle stays in that spot.

G91
G28
G90
G1 X185 Y185 F3000

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3 Reply by mr_tim34

  • mr_tim34
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  • Registered: 2013-02-17
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Re: Start gcode problems

I home the carriage in X and Y, then turn on the bed heater, 5 minutes or so later I start the extruder heater. When they are both at temperature I hit the run button, the extruder moves to the center and starts to home Z. I reach in with a pair of tweezers and pull off the oozed string and all is good from there. I like to watch at least the first layer to make sure all is well before leaving the printer on it's own.
Don't know if it's the best way, but it works for me.

TiM

4 Reply by joe3d

  • joe3d
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  • Registered: 2013-05-23
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Re: Start gcode problems

I first start the bed heater and while it is heating I Home the x,y and the z axis.  After the bed reaches temp I start heating the extruder. When it reaches temp I hit the extrude 10mm button. Since the extruder is hanging over the back corner edge of the bed , the extruded material just goes straight down. I reach in and pull this material off and hit the Run Job button.This seems the best way for me.

5 Reply by knowack

  • knowack
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  • From: Columbia, MO
  • Registered: 2013-12-05
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Re: Start gcode problems

joe3d wrote:

I first start the bed heater and while it is heating I Home the x,y and the z axis.  After the bed reaches temp I start heating the extruder. When it reaches temp I hit the extrude 10mm button. Since the extruder is hanging over the back corner edge of the bed , the extruded material just goes straight down. I reach in and pull this material off and hit the Run Job button.This seems the best way for me.

Same here, works great every time.