The print z was wrong previously when there is a wipe tower, or there
is an object with floating parts.
Jira: STUDIO-2719
udesk: https://bblcs.s5.udesk.cn/entry/ticket/show/2258732
Change-Id: Ifa070aeb548d692549cf88df0d405ecdf0160c80
(cherry picked from commit be3097d8044ce9e0079ebf7070b15c7aad7aff0e)