Missing material on last layer

Hi,

I noticed that our Prusa Mendel (v2) stops printing prematurely on the last top layer. The last few milimeters are left out and this leaves some ugly holes in the printed model. What can be the cause of this? We made sure that the extruder steps are correctly set in the firmware. If we put a marker on the filamen and tell for example Mac Pronterface to extrude 30mm, the marker moves exactly 30mm. Could there be something else wrong? Maybe slicing errors?

Here is an example of the last missing part:
[nicolinux.org]

Thanks.
Stefan

Edited 1 time(s). Last edit at 06/30/2013 11:59AM by Nicolinux.

like this?

[lh6.googleusercontent.com]

It's my first ever print (completed last night) and I think the same thing happened. It's an i3 running Marlin and I was using Repetier.

Jim

Yes like this. It looks very familiar... At least I know we are not the only ones with this error. Hope to find a solution.

It seems to be happening on all my prints

[lh5.googleusercontent.com]

It's not my biggest problem right now, so I'll look into it later. Has anyone else seen this?

@Nicolinux what is your tool chain?

I'm using repetier, Slic3r, Marlin on an i3.

Jim

Add M400 (Finish all buffered moves) at the beginning of the end code in your slicer.

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@Jimthree
My toolchain is: OctoPrint, Slic3r, Marlin, Prusa v1-v2.

@Bruce
Thanks, will try it. But how come that other printer don't need it?

Nicolinux Wrote:
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> @Bruce
> Thanks, will try it. But how come that other
> printer don't need it?

Other printer? Is it using Marlin firmware?

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No I ment in general. It is not documented (as far as I know) and other Prusa users have great prints.

I found this explanation in Marlin on github.

Quote
If you have an M84 "stop all motors" command in your end code then that can cause whatever is in your command buffer to stop executing. That is, G commands are buffered, M commands are executed immediately. So if there are any remaining G commands in the buffer (which I believe is only 16 commands long) when the M84 comes along, then you'll lose them. Placing an M400 "wait for buffer to clear" before your M84 will fix that problem.

Alright, I didn't see it. Should have tried harder.
I have added it to the custom gcode commands. I hope it will work.
Thanks again.