Running into an issue right now where the first layer squishes a lot more on the left side of my bed than the right. Currently testing by just printing a one layer strip from one side to the other on the x axis. I'm using a beacon for mesh bed leveling, and there were some dumb mistakes in the config, but as far as I can tell, everything there should be fixed. In any case, it seems like BED_MESH_CALIBRATE is doing its job, but is under compensating. Any ideas?
#`BED_MESH_CALIBRATE` is under compensating
unique zenith
hardy egret
Can you please send your klipper log, a picture of your bed mesh, and a picture of your printer as it is right now
unique zenith
At this point I'm thinking this is something gantry related, but not sure what to actually do. I don't really want to do a ton of re-tightening on the gantry if I can avoid it
sharp siren
Running into an issue right now where the first layer squishes a lot more on the...
can you confirm that during a print, the bed mesh is visible on the "heightmap" tab of mainsail and that the number above the z coordinate is changing as the toolhead moves around the build plate? this value is the z coordinate after the bed mesh has been applied
unique zenith
can you confirm that during a print, the bed mesh is visible on the "heightmap" ...
yep, I also disabled the mesh in my print_start and confirmed that it was actually doing something
sharp siren
yep, I also disabled the mesh in my print_start and confirmed that it was actual...
the range of 0.1333 isn't awful, and something that bed mesh should be able to compensate for
what tensions do you have for your z belts?
split osprey
ok i just went through this exact same issue, andi dont wanna butt in, but it ended up being my motor shaft being bent ( i had my tensions way to high, and were not double sheered)
Just something to take a peak at anyway 🙂
unique zenith
the range of `0.1333` isn't awful, and something that bed mesh *should* be able ...
the A/B belts are like ~2.25 each, they're evenly tensioned, probably a little high though
sharp siren
the A/B belts are like ~2.25 each, they're evenly tensioned, probably a little h...
i asked about your z belts 😉
a/b belts should be between 1.8 and 2.2
unique zenith
i am blind, just retuned them and they should be even, let me actually get a read though
around 2.8
sharp siren
around 2.8
on the higher end, but ok
if you request the z axis to move, say 100mm up, do all for corners move the same amount?
unique zenith
looks like it
sharp siren
looks like it
looks like is different from actual measurements 😜
unique zenith
can't really measure super well with the belts in the way but they seem very even
let me see if i can get some better actual numbers
they measure even
I haven't noticed any issues on small, taller prints, this is isolated to first layers on the left/right sides of the bed
unique zenith
ok i just went through this exact same issue, andi dont wanna butt in, but it e...
just at a glance I'm not noticing anything wrong with the ab motors shafts, what did that look like for you?
split osprey
When moving the axes back and forth, the idler wobbled ... could visibly see it
unique zenith
ah ok i dont think i was seeing anything like that
unique zenith
poking around the config and im at a loss, im still assuming it's gantry stuff, but i feel like i just don't know what im looking for at this point
unique zenith
Ok something I just noticed is that the a/b belts seem to shift up and down slightly as I move back and forth on the x axis
charred silo
Ok something I just noticed is that the a/b belts seem to shift up and down slig...
is anything edging out of its path? like is anything riding up on the edge of an idler anywhere, or anything like that?
oh, looking at your original issue, sounds like gantry twist
if your x axis twists, it changes the relationship between the probe and the actual nozzle (by rolling the toolhead)
which then results in the type of left vs right behavior you're describing
you can test with klipper's axis-twist-compensation module to see if I'm right
unique zenith
is anything edging out of its path? like is anything riding up on the edge of an...
ok yeah im seeing way more sane results with my test print, i think i need a little more fine tuning but this was probably it thank you!
im probably just gonna leave this software fix on for the time being, but is there anything i can do about it from a hardware standpoint in the future?
charred silo
im probably just gonna leave this software fix on for the time being, but is the...
Swapping out the x axis extrusion for one that isn’t twisted is the actual hardware fix most of the time. Nothing really wrong with using twist comp though, especially if it’s only a small twist