Develop a build time model for Stratasys J$5$ DentaJet PolyJet machine for dental parts as shown below.

The build speed for this machine in HQ mode is $120$ mm$/$s$.$ Layer thickness in HQ mode is $18$ microns.

Print head width is $50$ mm$.$ Consider that the jetting head can print material during each traversal of the

build area and $2$ passes of the head are required to fully cover the total build area. Assume that a delay of

$15$ seconds is required for cleaning the heads every $25$ layers. Using your build time model, compute the

build time for a layer of the denture part shown below.

Known: Platform length $=140$ mm

Platform width $=200$ mm

Print head width $=50$ mm

Height of printed parts $=30$ mm