it seems the CR-6 SE uses 120C for it's strain gauge based bed leveling,
so we'll make this our general default, so we can limit the number of
start_gcode variants we'll need to maintain.
this also introduces a 10 second dwell before any homing happens, to
allow the nozzle to warm up, so that any filament stuck on the nozzle
becomes somewhat pliable.
With low prints, moving the print head up 70mm can still be too low
to be able to remove a print conveniently, so make sure the print head
is at least 60% up at the end of a print.
reduce the prime line sufficiently so the Ender-2 no longer requires
a seperate start_gcode
the extrusion pressure is scaled proportionately, and reduced slightly,
as previously some nozzle ooze could happen between the prime line and
the skirt loops due to excessive pressure buildup
Replace hardcoded print presentation coordinate with print_bed_max[1],
where we move the print bed ~3/4 of the bed size across the y axis
at the end of the print.
At 50C prints with sharper corners can be prone te warping if the
first layer height isn't quite optimal, and given that most Creality
printers don't have ABL, it often isn't.
So to optimize chances of getting good non-warped prints, we keep
all PLA bed temps at 60C for Creality printers.
given the diversity of printers and bed types and a typical lack of
auto bed levelling, it will be impossible to get a good fit
for everyone by default.
A very conservative 0.1 for elefant_foot_compensation is unlikely
to cause overcompensation.
And I'd prefer to undercompensate as opposed to overcompensate
as a default.
