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A axis as extruder
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Topic: A axis as extruder (Read 7168 times)
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kak
81
A axis as extruder
«
on:
August 03, 2013, 04:08:00 PM »
Hello
I started my journey with reprap and Mach3 and I have 2 big problems.
This is one of them.
I use A axis as an extruder, which is pushing the filament down through a nozzle, but when it´s not printing it is supposed to retract / pull back the filament very fast, so it doesn´t drip and leaves strings through the printed part. Unfortunately it does.
I noticed that it´s retracting as long as the X and Y axis is traveling from one point to another. It should retract very fast before X and Y moves.
You can see it on the video. Some fast retractions and a slow one at the end, time 0:24
http://www.youtube.com/watch?v=Hy1L3p4mNO8&feature=youtu.be
Is there some settings that can change this behavior?
I´m getting arachnophobic when I look at some of my parts :-)
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Peter Homann
513
Re: A axis as extruder
«
Reply #1 on:
August 03, 2013, 07:06:32 PM »
Hi,
The problem is that the Gcode is doing a combined axis move i.e. G1 *********x Yyyy Aaaa
This means that all 3 axes will reach their end point at the same time.
You need to do the A axis move first then the XY move.
G1A aa
G1 *********x Yyyy
Cheers,
Peter
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----------------------------------------------------
Homann Designs
http://www.homanndesigns.com
email: peter at homanndesigns.com
kak
81
Re: A axis as extruder
«
Reply #2 on:
August 03, 2013, 11:21:56 PM »
Yes, thanks, it sounds right. But I don´t want to edit 10.000 lines of Gcode :-)
Is there a check box somewhere that can change it?
I´m using software called Slic3r ( Slicer), which is made for reprap, so I guess the generated Gcode is ok.
«
Last Edit: August 03, 2013, 11:35:30 PM by kak
»
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Hood
25,835
Carnoustie, Scotland
Re: A axis as extruder
«
Reply #3 on:
August 04, 2013, 06:13:22 PM »
No there is no setting in Mach to do that, Mach reads, interprets and executes G Code so if your G Code is wrong for what you want then Mach will do it exactly as your "wrong" GCode is saying.
Hood
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kak
81
Re: A axis as extruder
«
Reply #4 on:
August 04, 2013, 08:57:27 PM »
Thanks. Thats also what I found out today. As Peter said, Slicer software combines retracts with moves. Mach3 wins again and again :-)
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Peter Homann
513
Re: A axis as extruder
«
Reply #5 on:
August 04, 2013, 09:39:44 PM »
Hi,
Are you sure that your slicer software can't be configured to output the Gcode to do the retract then then move.
I did notice that the post processor for Slicer can be edited.
Also ask the question on the Mach3 Yahoo group. I few guys there are using Mach3 for 3d printers.
Cheers,
Peter
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----------------------------------------------------
Homann Designs
http://www.homanndesigns.com
email: peter at homanndesigns.com
JohnHaine
799
Re: A axis as extruder
«
Reply #6 on:
August 05, 2013, 02:43:16 AM »
There's a thread somewhere here on using Mach to drive a 3d printer. I think either slic3r or skeinforge are used as plugins. I hope so anyway as I am fitting an extruder to my mill!
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kak
81
Re: A axis as extruder
«
Reply #7 on:
August 05, 2013, 10:25:58 AM »
I have seen the Slic3r plugin for Mach3 thread. It didn´t work for me. But it´s not necessary. In Slic3r you just select " Gcode flavor" as mach3/emc and it will replace the E letter with A in the Gcode.
But combine moves is that´s how Slic3r is working. Other slicers retracts before move, but not all of them has the Mach3 option.
Thanks Peter, I will look at Yahoo groups.
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JohnHaine
799
Re: A axis as extruder
«
Reply #8 on:
August 05, 2013, 11:26:39 AM »
Actually it wasn't Slic3r but Skeinforge I was thinking of - see this website
http://cnc2printer3d.wordpress.com/the-concept/
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JohnHaine
799
Re: A axis as extruder
«
Reply #9 on:
August 05, 2013, 11:29:00 AM »
...and this thread -
http://www.machsupport.com/forum/index.php/topic,16310.0.html
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