nozzle_prime.cfg not an issue, but discussions is not visible

[massamino]

I think I found the formula for the priming:
Line 26: # I'd expect E-vals to be 15, but I'm getting ~8.38

It is not exactly 15, but I think the math is correct:

line_width (lw) = 0.7
layer_height (lh) = 0.28
filament_diameter (fd) = 1.75
distance (d) = 180

(the filament volume used for the distance without a nozzle)
volume_raw_filament = (pi * (fd / 2) ** 2) * d =  (3.14 * (1.75/2)**2)*180 = 432.95...
(the volume we need for our line width and height)
volume_layer = ((pi * (lh / 2) ** 2) + ((lw - lh) * lh)) * d = ((3.14 * (0.3 / 2) ** 2) + ((0.7 - 0.28) * 0.28)) * 180 = 32.25...
(volume difference between the two in %)
volume_difference = volume_layer / volume_raw_filament = 0.07449...
(length we have to push through)
filament_to_extrude = d * volume_difference = 180 * 0.07449... = 13.4086...

I guess the 15 comes from another length (200) or a wider line (0.8)

https://github.com/massamino/klipper-config/blob/main/macros/prime_line.cfg

[dudeofawesome]

Thanks for looking in to this! I'd love to see a PR merging this in!

[massamino]

merge in where?