tesla893/printrbot-variant — comment on commit 261e88660c1be40da17e3c6e4e7f3550f3b2ae0d
File: printrbot variant.scad	 line 9
By whosawhatsis:

end_height is the height of the base_end pieces, and needs to be at least 4 or 5 mm more than the height of the motor bodies, or the bottoms of the motors will be the lowest point instead of the feet.