Best posts made by PXP11

@JoergS5
So I actually thought about the preference angles when constructing the 5 axis Voron. The printhead was designed accordingly to accommodate an A-angle of up to 90°+ (A90) while having the nozzle as close to the build plate as possible. As of now I have set the max angle at 90° but it can accommodate at least up to 110°. Also for visibility purposes it's much more preferrable than the negative A-angles. And in general on commercial 5 axis machines and CAM Software or rather post processors, the next positive C-angle is always preferred for the possible solutions. If the C-axis is freely rotating that is, some cheap trunnions for example have to turn back to 0 after 720°.

@droftarts
So I did some test prints and there were VFAs but not as bad as I would have excepted, considering the sometimes absolutely frightening resonance while the X or U axis were moving. It was actually hard to take a picture of them because they were barely noticeable. I don't have any input shaping configured yet. And some slicer settings will definitely be addressed.

I also played around with the StealthChop settings that were suggested in the TMC2209 paper. However I could't notice any impact .So I blindly tested different values for the hysteresis settings, as well as blank and off times. Good news, the motors are still alive. Bad news, I couldn't make out a difference. I got them back to the settings I started off with.

I ordered some new Nema14s. Will be interesting to see if that makes a difference and if it was a hardware problem all along.

@nie-ls
Yes swapping out the motors did actually help. Totally forgot to close this thread...
Now they are whisper quiet in stealthChop mode as they should be. Searching a problem with the most obvious solution is time not well spent. In your case I would suggest swapping out the motors too. I don't know what was wrong with mine, but I could instantly feel the difference between old and new when turning the drive shaft by hand. No resistance or indexation. Due to the fact that even damper mounts can't help in your case, I would clearly point the finger at your NEMA 17s. If you have an other NEMA17 variant to swap out, try that. Otherwise they are not too expensive, as long as you don't use any special variety.

@noobydp
I got theses ones: aliexpress
They matched the original sigma nema 14 steppers the closest. The manufacturer stepperonline is reputable and also has its own webshop. Depending on where you life and how much time you want to wait on your steppers the webshop ist the better place to order from.