Hi,
i have some issues or understanding problems with pressure advance and i hope someone could help me. I need to mention that i am not sure if this is a pa problem at all.
So far i made a little progress with my printer. I needed to exchange a few things and the printer is listed as a corexy, but in fact it’s an inverted cartesian. Since i change everything and it’s doing as intended. I was not aware and haven’t realy peaked into the mechanics of the different typs of printers. Meanwhile i did an yeah “my fault or lazyness to be honest” - some need to learn the hard way 
.
Anyway - i am currently struggling with pressure advanced. As i mentioned i already changed a printer to klipper from marlin and everything was pretty straight forward. Now it’s a Bowdensystem and it seems to behave way different then all i did before. Or let me say there is an persistant issue i can’t solve myself.
I did the calibration part 3 times and was always at 0.5014 - 0.5141 with the result (0+messured high*0,020 - the factor for bowden from the guide). The overall quality is better, but corners still looking bulgy and rounded - what they didn’t on the messured hight of the calibration part - i proceeded as on my CR6-SE (with dd extruder mod) and there i have absolutely sharp corners.
Could it be that maybe acceleration is to high or that i am using square_corner_velocity with the default of 5.0, atm printing with 100mm/s (150mm/s is the extruders and hotends limit).
[printer]
kinematics: cartesian
max_velocity: 150
max_accel: 2000
max_z_velocity: 10
max_z_accel: 30
square_corner_velocity: 5.0
[extruder]
step_pin: P2.13
dir_pin: P0.11
enable_pin: !P2.12
rotation_distance: 33.25000
microsteps: 16
nozzle_diameter: 0.400
filament_diameter: 1.750
heater_pin: P2.7
sensor_type: EPCOS 100K B57560G104F
sensor_pin: P0.25
control: pid
#PID at 210°C
pid_Kp: 20.080
pid_Ki: 0.864
pid_Kd: 116.716
min_temp: 0
max_temp: 250
min_extrude_temp: 170
max_extrude_only_distance: 1000
max_extrude_cross_section: 0.64
Pressure_advance: 0.5014
pressure_advance_smooth_time: 0.040
if i print the basic cube infill it’s exaclty 20x20x20mm with corners 20.10x20.10x20mm wall thinkness is also fine, a cube without infill and 2 walls are exactly 0.80 by 0.40 layer width. I did skew correction first cause got a bit allignment issues, it varied 0.01-.02 on every side at the beginning, what is gone now, but i have exactly 0.05 corner overshoot on every single one - it sounds like nothing, but make things doesn’t fit.
I am realy at the end with my knowledge and hope someone could help !
Thanks and Regards
BPM
