1. use strict ordering to ensure the printing order is right
2. reduce height-to-lid to 100mm considering towline is lower than lid
and may collid with objects
TODO: printing brim may still collide, need to subtract inflated boundary of
others during brim generation
Change-Id: Icf0cba10c579d28fabd97764c1b3abec267ebd9b
(cherry picked from commit 46c6f5ff94488b2f4481bf1d34555f4a7c45e135)