Commits on Apr 29, 2022

1. Factor most of the magic-numbers out of PRIME_LINE …

   This allows customization of the line's origin, direction and length.
   Compared to the status quo, this should be a big help for the
   macro-customizing type of person in case they mindlessly fill the slicer
   plate with models and disregard the ~8mm of margin that the default
   hardcoded origin (5,10) requires.
   
   Additionally, this makes the line's E-values calculated entirely from
   simple physical facts, including the nozzle bore which can be passed in
   as a parameter if it's not 0.4mm, and the filament bore which is assumed
   to be 1.75 (because Jinja2 does not import the math library so instead
   I precomputed and hardcoded the filament's cross-sectional diameter).
   
   Lastly, this includes a solution for an annoying problem where the
   nozzle consistently goes a bit cold during the prime line,
   causing SuperSlicer's insistently-inserted M109 to not immediately pass,
   causing a long pause after the prime line which defeats the purpose of
   the prime line by allowing the nozzle to deplete itself via oozing.
   
   I've tested this on my V-Minion quite a bit, and it seems to produce
   similar results as the status quo.

   

   mmirate committed Apr 29, 2022
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