The extruder offset of X1 and X1C is (0,2).
All generated gcode should minus this value.
Also change the min speed of cooling buffer for
better cooling for small area(from pineapple)
Signed-off-by: salt.wei <salt.wei@bambulab.com>
Change-Id: I06e58a26f8736ae24fa9da02477a9d19114daeca