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lift breaks Z?

Posted by se5a 
lift breaks Z?
June 28, 2012 09:29PM
This is the Gcode for some thumb wheels and nut traps.
when I print this, the printer does not increase Z
I suspect that there's something wrong with lift, since after re-slicing without lift it printed fine.

can someone check this gcode and tell me if I'm correct?

or rather I would have posted the Gcode, but aparently it's too big.

Edit. Lift, not retraction. duh.

Edited 1 time(s). Last edit at 06/28/2012 09:34PM by se5a.
Re: lift breaks Z?
June 29, 2012 01:43AM
se5a Wrote:
-------------------------------------------------------
> or rather I would have posted the Gcode, but
> aparently it's too big.
>
> Edit. Lift, not retraction. duh.

You can attach a portion of the g-code, which would help.


Cameron

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Re: lift breaks Z?
June 29, 2012 02:58PM
and zipped.
Attachments:
open | download - thumbwheels_part2.zip (506 KB)
Re: lift breaks Z?
June 30, 2012 09:44PM
Well - the gcode shows 0.1mm layers, with an apparent 0.2mm lift for moves,
up to a model height of 1 mm

You would have to include the STL for any further comment on whether this makes sense or not.

I found that Z backlash made Lift pointless on my Prusa. It would not return from the lift height back to the current print height, leading to a nice plastic rendition of a kittens ball of wool.
.
Re: lift breaks Z?
July 01, 2012 12:00AM
I used the same stls (it was two, both with 4 copies) without closing slic3r and removed the lift, and 0.2mm layers (realised 0.1mm was way overkill) and the whole thing printed fine.
I see where the z is in this gcode now, I'll check the full one when I get home.

maybe you're right about the lash... though it seemed to be going back down too far...
lift has worked just fine for me in the past.
Re: lift breaks Z?
July 01, 2012 12:57PM
Assuming it's not a gcode issue, which I'd be surprised if it were.
The lift is probably trying to move Z faster than the regular layer changes resulting in lost steps.
Backlash should only impact the very first time the lift occurs, it's usually repeatable and it doesn't accumulate.
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