RE: Layer Shift
I have two X1C printers and am printing these Transformer Flexi’s for my son’s classmates.
The first one (megatron) went fine. Then I ran Shockwave and SkyWarp and they were both fine.
Feeling rather confident I loaded up both X1C with Optimus and Bumblebee and let 'er rip.
28hrs later I get two models with bad layer shift. Both printers f’d up. There was a clog of the poop chute, but no power cycles or anything like that. I didn’t move the head to clear the clog either and the layer shift had already occurred
I reran them with everything the same and this time Optimus came out fine, but Bumblebee had a very small layer shift - in about the same place too.
What could be causing this? I’ve never had this problem before with my X1Cs.
They are both on Bambu anti-vibration feet. None of the maintenance alerts are going off. The front of the head didn’t get knocked off.
Something is going wrong and IDK what it could be.
Correct me if I am wrong, but you started to print two different models in two distinct printers (both X1C), and in both cases, you got a layer shift. That is strange, and the only thing I can imagine to result in a layer shift in two printers is a power surge event.
Some possible causes for the Bumblebee which results in a layer shift twice in the same spot:
3D model → If can be not very accurate, and the file type is also essential;
Printer → Did you implement mods? Check for debris or minor poops lying around steppers or axis. Belt tension.
Both are easy to check, as shown by printing the Bumblebee in the other X1C.
Download MeshMixer and inspect the STLs for geometry errors, though I don’t expect you’ll find any since if there is an error it should be 100% repeatable.
Slow down all the slicer accelerations. If I let my X1C run at high speed, it tends to miss steps and rehome a lot on travel moves. The extrusion speed is going to be limited by the flow rate, but the travel speed will not be. The printer defaults max that out. Which means it’s also maxing out acceleration. So Travel is definitely worth slowing down.
Reducing all the accelerations by 20% will not have a meaningful impact on print time for your models, it might prevent the step loss/layer shift, it will make the printer noticeably quieter when printing.
