Hi,
I’m still struggling with my printer, getting it working with Klipper. Currently, I’m stuck to get a working Bed_Mesh and noticed something. With a delta printer, it probes a round bed, but the bed mesh shows me a rectangular bed, with probe points which were never probed, and are outside the bed. And one of those probes is a weird spike with I think is messing with the actually taken probe point values.
As you can see the probe point, shown in the picture, were never taken, and the coordinates are outside the print bed.
I changed my effector and rod connectors to make sure that my self printed ones are not at fault, causing effector tilt or something. I also installed springs onto my print bed to adjust it heights, so everywhere the nozzle has the same distance to the bed. I tried various Bed_Mesh settings, but the bed mesh always have this shape, and this spike.
Has anyone idea what causes it, and how to solve it?
I know, but what the bed mesh visually shows me is that the most of this deviation is coming from the spike shown in the screenshot, which is a point that never been probed. I can’t even reach this point with my tool head. But doesn’t the bed_mesh uses the probe points values to create a bed_mesh.
A Spike like that could “pull” up my mesh on that area, making it unusable for me.
You should go by your klippy.log. This is what Klipper has probed and what Klipper is using.
When looking at the visualization then the first noteworthy fact is that it apparently cannot deal with round beds. Maybe there are other issues as well.
This is something you better would rise at the respective UI you are using.
Ah, I see, so I should not rely too much on the visualized bed_mesh.
I can not figure out why the bed_mesh is such a mess. When using it the nozzle is all over the place, currently absolutely unusable …going to try Bed_tilt instead.
Generally the probing of a round bed looks a bit weird. Ref to Bed Mesh - Klipper documentation. I would not go by the visualization but by the quality of your first layer. If this is working, then apparently your mesh is working.
bed_mesh and bed_tilt are fundementally different:
bed_tilt treats your entire bed as one plane and tries to compensate for a tilt. This means each point is treated the same in relation to the tilt.
bed_mesh cuts the bed in little segments and tries to compensate for bumpiness / unevenness location specific. This means one point can go up, the next down.
Right now I am at work, but have some free time, digging on the internet about my issue. Found a post from 4 years ago where it turns out Klipper having no working support for bed_mesh_leveling round beds. Don’t know if it still the case today, but feels like.
Since I have an Anycubic Ultrabase glass bed, I assume by bed being very flat, so trying out bed_tilt be an option.
As I said, my nozzle is all over the place with the bed_mesh, and without my first layer is crap. I need some sort of compensation.
What I also noticed so far, the web seems full with people having same issues like me, bed_mesh not working and stuff.
Just an assumption, maybe unless your bed is already almost dead flat, bed_mesh is just unreliable. But I know that’s probably not the case.
I tried Bed_Tilt by now, and it didn’t help either.
I noticed my effector having a little tilt, wasn’t an issue under Marlin, maybe Klipper can’t handle it, trying to figure out where the tilt comes from, have to replace some stuff and test it out.
I’ve run into the same problem and at this point I’m stuck, I installed klipper on my old delta printer, and I’m thrilled, but when I tried to do mesh calibration to compensate for errors on the outside edge, something just doesn’t work . Additionally, both Mainsail and Fluidd display the mesh plate as square even though it is evidently circular.
But this wouldn’t be a problem if the mesh compensation worked.
Maybe there are only a few of us left using old Deltas, now everyone uses CORE XYs, but it’s a shame because the movements of the Delta’s arms are fascinating.
Since I couldn’t get it to work, I switched back to Marlin. About a year later, I tried Klipper again, and it worked without doing anything different.
What I learned is that unprobed points are given a calculated assumption, that’s why it still shows a rectangular mesh. In the end, it’s just visual and can be ignored. Another thing I learned is that Deltas must have their level probe sit directly under the nozzle, offset 0,0. If it’s mounted with an offset, probing the whole bed becomes impossible, and when the nozzle moves into the unprobed outer area, sudden unpredictable movements can happen… Mostly a crash.
Currently, my Delta works flawlessly with Klipper and is up for sale, since I treated myself to a Voron and don’t have the space for two printers.
