FlashForge Creator Pro 2016+ extruder lag

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tbfohman
 
Posts: 3
Joined: Fri Feb 10, 2017 9:10 pm

FlashForge Creator Pro 2016+ extruder lag

Sun Feb 12, 2017 7:24 pm

Good day,

I hope someone can help me with this.
When starting any print, the initial extrusion doesn't create extrusion for approximately 5-10mm.
I mean, the toolpath is running, but no plastic comes out at the start. This distance is the same for any partfile.
This doesn't seem to be a temperature, or nozzle flow issue - I've messed with both. I've also experimented with retraction length and restart distance.
Any help would be greatly appreciated.

Capture.JPG
Attachments
Spring Tensioner.factory
(14.28 KiB) Downloaded 3 times

brian442
 
Posts: 347
Joined: Mon Nov 28, 2016 5:35 am

Re: FlashForge Creator Pro 2016+ extruder lag

Mon Feb 13, 2017 4:59 am

This is pretty normal. It's why you use a skirt. That way the extruder can get fully primed on the skirt before it moves to the actual model.

tbfohman
 
Posts: 3
Joined: Fri Feb 10, 2017 9:10 pm

Re: FlashForge Creator Pro 2016+ extruder lag

Mon Feb 13, 2017 5:49 pm

Thanks so much for the reply....

Does it need to "re-prime" after the initial prime/wipe at the edge of the table?
I've been researching, and it seems that there might be a "deprime" command in the generated G-code/x3g.
If this is true, then this would negate the priming routine at the end of the start script (I would imagine)
Is there a way to disable the FFCP's deprime function?
I use a skirt to verify all is good, but what often happens is the extrusion starts slowly extruding (while traveling) and a tail or a curl is created at the beginning of the extrusion line. This tail mucks up the following layers, and has even been snagged a drug about with the secondary nozzle.
(You can see this tail in the "start here instead" circle - pointing toward 8 o'clock, in the original post's image)

brian442
 
Posts: 347
Joined: Mon Nov 28, 2016 5:35 am

Re: FlashForge Creator Pro 2016+ extruder lag

Tue Feb 14, 2017 5:50 am

Again, this is really normal, and I see this on almost all of my printers. That's why you use a skirt, since you just throw it away in the end.

But if you really want to mess with it, then you could probably write a custom starting script to prime the nozzle someplace else

tbfohman
 
Posts: 3
Joined: Fri Feb 10, 2017 9:10 pm

Re: FlashForge Creator Pro 2016+ extruder lag

Mon Feb 27, 2017 1:53 pm

Hey Brian - thanks for getting back with me.
My start scripts do prime the nozzle (purges 15-20mm), extrude a line across the bed, and wipe the nozzle. She then moves to the starting point of the print. I also do use a skirt with no part offset to aid in bed adhesion.

When starting the actual print, at the starting point, the extruder lags in producing extrusion for around 5mm. I honestly can't think that this would be normal operation. I've attached a factory file, if you'd like to check it out.

Thanks for your help with this.
-Scott
Attachments
RJ-WSC-FRP Front.factory
(42.56 KiB) Not downloaded yet

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dkightley
 
Posts: 860
Joined: Tue Mar 10, 2015 3:09 pm

Re: FlashForge Creator Pro 2016+ extruder lag

Mon Feb 27, 2017 3:54 pm

If you're referring to the visual representation of the printing not exactly mimicking the actual printing process whilst you print via USB....then what you describe is exactly what happens....and nothing is wrong.

Because there is no feedback from the printer, the software has no idea what the printer is doing. It merely transmits a series of commands to the printer via the USB connection....and the simulation speed is calculated from the same sequence of commands. Printers take different times to execute the stream of commands....hence the real print lags behind by an unknown time delay.

Hope this explains things...
Doug Kightley
Volunteer at the National Tramway Museum http://www.tramway.co.uk
Railway modeller and webmaster at http://www.talkingtgauge.net

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