What would cause a printer to suddenly start printing with a different XY origin?
The position of the print head, which should be at the center left after a Stop Print and instead is at the front seems to indicate that the XY home position got lost. This has happened twice in the last day on similar but different large models, at different heights. It hasn’t occurred with smaller models, maybe it only happens after a certain amount of time.
Any ideas? The printer in question is a Creality K1 Max.
Is the print still on the bed? My guess is it came loose and perhaps it got bumped by the head.
Starting point clean the bed and perhaps a dab of glue and try a test print.
Also check the head moves fully to all stops with nothing snagging or hard spots.
try using a different slicer and see if it stops.
The bottom of the print is still firmly attached to the build plate. I’ve actually found a model that I previously printed successfully but it also does a big jump like this but quite near the start of printing, thankfully saving me a lot of filament doing test prints.
I did a slice using Creality Print and got the same phenomena so, combined with the previous case of a file that had printed before and now has an issue, it doesn’t seem to be a slicing issue.
To me, it sounds like mechanical/hardware issue. Have you watched the printing closely to see if the nozzle is ever hitting the print during travel moves? If it is, setting the slicer to do a z-hop when retracted would help. The nozzle would be most likely to hit if edges of an overhang are curling up. If ambient conditions or material changed slightly, that might have been enough to reduce the curling such that the nozzle didn’t hit. At any rate, I’d try adding a z-hop if you don’t already have one set. Not really anything to lose by trying it.
Have you also checked to make sure that the rods have been lubricated properly and that the belts are properly tightened? If the belts are too loose or too tight it can cause issues, you have to find that goldilocks zone for it.
The belt and the rods seem okay to my untrained eye.
I’ve found an issue with the Cura generated gcode and posted a query on their forums:
The part seems to print okay if I reduce speed to half for the bottom layers where the crazy travels are occuring. Although, looking at the animation in Cura it looks like they occur during the top layers as well…
Have you tried using orcaslicer? That is what I use pretty much exclusively now and I have never had any issues!
I also like orca and or Prusa slicer. The thing to keep in mind no one slicer will slice every model well. I tend to use Prusa most but cura some as well.
What travel speed do you have set?
I’ve got travel speed at 800mm/s. After reducing the wall speed I’m no longer getting the sudden offsets. Now I’m wrestling with delamination on the leading and trailing edges of the model, especially the trailing edge which is a thin tapered edge.
I’ll look at the Orca slicer if I get to the point where I want to push the speed, it’s a little disappointing to be limited to 100mm/s when the printer is supposed to have a “typical” speed of 300mm/s.
Edge lifting is a common problem, cured with glue usually. Elmers school glue works, or the cheaper PVA equivalent.
Is the separation part way up? Not at the bed? Is this correct?
What material is it?
Separation at mid layers is often too low temps, over cooling or drafts.
What layer height are you using? Excessively large could also do the same.
It’s typical that speeds are over estimated. My Bambu can’t manages to keep up with its posted speed. It can’t heat fast enough. At the end of the day you can get good perfect prints or fast prints. Not always both. If speed really matters a lot try using a 0.8 nozzle it will make faster prints (until the hot end can’t keep up) and way stronger prints.