Let's assume that on your picture:
- tower X is on bottom-left and the build plate point near its base is A
- tower Y is on bottom-right and the build plate point near its base is B
- tower Z is at the top and the build plate point near its base is C
- centre is D
- the build plate point as much opposite of A as possible is α
- the build plate point as much opposite of B as possible is β
- the build plate point as much opposite of C as possible is γ
You probably have bad tower position Z (seems like it's radial position should be more far away from centre in firmware (because point γ is too low)). You probably also have a slight error in both diagonal rod length and delta radius errors which compensate each other.
If you are good at math and know a little bit of C and have a z-probe then read some maxima tutorial and try to execute this notebook (requires single-point measurements from a z-probe): [github.com]
If you are not good at math and know a little bit of C then read the comment cells at the beginning (till the first "input start" cell) of the notebook and try to calibrate it manually.
The bit of C knowledge is there so that you can set tower positions explicitly and for each tower differently in your Configuration.h.
If you are lazy to do it manually (or you do not know a little bit of C) and have a z-probe then you can try the firmware published in this thread: [groups.google.com]
Good luck.
- tower X is on bottom-left and the build plate point near its base is A
- tower Y is on bottom-right and the build plate point near its base is B
- tower Z is at the top and the build plate point near its base is C
- centre is D
- the build plate point as much opposite of A as possible is α
- the build plate point as much opposite of B as possible is β
- the build plate point as much opposite of C as possible is γ
You probably have bad tower position Z (seems like it's radial position should be more far away from centre in firmware (because point γ is too low)). You probably also have a slight error in both diagonal rod length and delta radius errors which compensate each other.
If you are good at math and know a little bit of C and have a z-probe then read some maxima tutorial and try to execute this notebook (requires single-point measurements from a z-probe): [github.com]
If you are not good at math and know a little bit of C then read the comment cells at the beginning (till the first "input start" cell) of the notebook and try to calibrate it manually.
The bit of C knowledge is there so that you can set tower positions explicitly and for each tower differently in your Configuration.h.
If you are lazy to do it manually (or you do not know a little bit of C) and have a z-probe then you can try the firmware published in this thread: [groups.google.com]
Good luck.