Bad Layer Starts

[jbert50021]

I am printing the .5mm thin wall cube. Everything is perfect except the one wall which the printer starts layers on. It is full of globs and a few holes. I tested the print with random start points but the wall was still a mess. What would cause this symptom?

Thanks,

Jason

[foshon]

I am printing the .5mm thin wall cube. Everything is perfect except the one wall which the printer starts layers on. It is full of globs and a few holes. I tested the print with random start points but the wall was still a mess. What would cause this symptom?

Thanks,

Jason

Globs and holes are symptoms of flow issues. Do this and see how it looks afterwards:

http://forum.seemecnc.com/viewtopic.php?f=54&t=1163

[jbert50021]

Thanks - I am done following the posts instructions. It is definitely an improvement, but there are still some globs. Is there an acceptable amount of globing or should it be perfect?

I now notice that there is an overall slant to one side. it does not look like there was one slip, but just a steady gradual slant...thoughts?

Thanks,

Jason

[foshon]

Thanks - I am done following the posts instructions. It is definitely an improvement, but there are still some globs. Is there an acceptable amount of globing or should it be perfect?

I now notice that there is an overall slant to one side. it does not look like there was one slip, but just a steady gradual slant...thoughts?

Thanks,

Jason

A picture would be very helpful.

[jbert50021]

Here are some pictures

The first shows the slant to the right.
The second two show the globs on the starting side.

I hope these are clear enough - they are the best shots I could get.

Thanks,

Jason

[Jimustanguitar]

I was seeing this too. The imperfections are the start and stop points for each layer. The slant may just be a temperature thing. It may be warping or melting depending on your settings. 80c and 230c are good starting points.
The things you're seeing are likely a result of several variables. Do the walls measure to spec (.55mm)?

I had an issue where the wall thickness would vary from one side to another, and slicing the same stl with Cura or KISS yielded more consistent results. Have you tried this shape with either of those programs? I would recommend it as a test.

[foshon]

The little pock marks are fairly common. You can try speeding up retracts, increasing extruder acceleration/jerk, I have yet to find the cure-all. The slant is interesting, does it always face the same axis? Do you have a fan pointed at it?

[Jimustanguitar]

I know there's still a calibration tweak to administer, but later on when you're printing something cool, Cura has a feature called "Joris" that you should play with. It prints thin wall objects like this in one continuous spiral instead of many individual flat layers. This completely eliminates the need to start and stop for layers, and works really smoothly with a delta bot.