STL problem or GCODE conversion problem ?

Hi all,

I have created a small 3D object with OpenSCAD.

The object looks good, I have exported to STL.
see STL :
cover02.stl

I open this STL in RepSnapper ... still looks good.
I convert into GCODE. .(no special parameters) ...

The aspect of the object seems good on the screen.


During the printing, and on more/less each slide, on the Y axis, a gap appear ....

See pix :



Any idea ??

I have tested with some others objects (coming from web) .. and never seen this before.

Edited 1 time(s). Last edit at 09/14/2010 08:25AM by didis_be.

... seems one axis looses steps

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Viktor
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Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]

Yep


But strangely, others objects (coming from internet, like : minimug) are working
=> no step lost

So, I'm asking where in the conversion process OPENSCAD -> STL, or STL->GCODE the problem appear ...

... maybe the position of the object in the building zone?

It could be a friction- and/or speed-issue too ...

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Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]

Hi,

Thanks

I will try again this evening ...


Regards

The y-axis can skip when the nozzle catches on a blob on the object. That tends to be object dependent. Also it looks like the object lifted from the bed at the left most corner. That can cause it to snag on the nozzle.

It could be a loose pulley. Did you put a small flat on the motor's shaft?

Or it could be that the motor current is set too low.

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[www.hydraraptor.blogspot.com]

Thanks for your reply.

I will investigate all these possibilities

1) normally, no blob.
I still have to mount a heat-bed to avoid wrapping effect.

2) Loose pulley => possible, because I did not put a small flat on the shaft.
:/
may be ..

3) Current too low .. don't think, because I have already printed +/- 10 objects without problem

Bests

Quote

Current too low .. don't think, because I have already printed +/- 10 objects without problem

Yes but the amount of friction on the nozzle is very dependent on the object, especially if it warps.

Be sure to protect the bearings of the motor with blue tack or similar when filing it. You only need to make a small flat where the set screw meets it.

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[www.hydraraptor.blogspot.com]