After building a Delta printer, I noticed that my whole prints are slightly tilted around the Z-axis in comparison to the slicer (e.g. Cura). There is no twist layer wise. This means, the prints themself look actually perfect.

I just don't know what could be the reason of the rotation. I do not believe it is a build issue of the printer, because I tried to keep the printer frame pretty stiff and symmetric. Could it be, that the Auto-Calibrate Feature of Marlin can add such a rotation?

The picture below illustrates the problem. I expect the black alignment of the print and get the orange one. Note that the print is still a rectangle with ~90° corners.

enter image description here

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    Not quite sure what you mean by "tilt around the z-axis"? Could you provide an image of what you're talking about? – Pᴀᴜʟsᴛᴇʀ2 Oct 29 at 21:04
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    Thanks, I updated the the question and agree with the critique that the question is hard to understand without illustration. – dgrat Oct 30 at 9:07
  • Is the whole print twisted (so your print is perfect)? Or is each layer a bit twisted with respect to the previous layer? Please clarify in the question and preferably add an image. – 0scar Oct 30 at 10:34
  • the whole print is twisted, so it seems perfect. I will add a picture when I am home. – dgrat Oct 30 at 10:42
  • Please describe the answer (your edit in your question) in a proper answer, I think it is you that can best describe the problem . Also remove the edit text, and remove the answer in the question. Also add photo's of the described horizontal translation. You can accept your own answer after 48 hours! – 0scar Nov 7 at 9:31

I figured out that the reason is probably a slightly translated slider construction. Instead of using a proper centered slider as shown in red, I used a slider construction like illustrated in yellow. When all sliders are translated on each tower like this, the print should be tilted by the same amount. This seems to have no influence on the general shape of the object. However, for my next printer I will use a proper centered uni-body slider.

enter image description here

  • Actually, this side-aligned configuration is probably better for a multi-part slider, because a side-aligned slider is alignable consistently on all 3 sides, while a center aligned multi-part slider is harder to align correctly. – Samveen Nov 7 at 16:09
  • True, at first I thought such a multi part slider would be a nice idea, because of reusability. Later I got tired while doing the assembly (inserting press nuts, ..). Now, I would only suggest to design perfectly centered uni-body sliders. – dgrat Nov 9 at 8:51

If I am reading this correctly, your prints are being either stretched or your prints are shifting / leaning on more complicated prints.

In this case, given that you are on a Delta printer, my answer is the same for all. I usually do Cartesian based 3d printing but the concept is the same for any drifting or leaning. You simply need to recalibrate your steps per MM for each motor, and tighten your belts. You will have the complication of the interaction of the 3 arms, that others will be able to answer better. But in the end, if each arm moves as it should, the belts are not slipping, and you do not have issues with moving too fast (jerking can cause the belt to shift, and a loose belt can cause whiplash / and other print artifacts). My bet is your steps per MM is off on one of the motors, or you could have an overheating issue (not likely).

There are many guides to help with Delta specific calibration.

I can provide a better answer with photos. See Stackoverflows guide on asking questions.

Edit with the diagram (not a photo), you issue might be caused by stepper over voltage and you will need to adjust your pololus. If you hear a repeating Thud noise, you have your voltage too high.

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