Monoprice Maker Ultimate Extrudes Too Much Filament At Start
Changing the Simplify3D start script to this will change the nozzle purge to the same length as what was on your SD card.

    G28 ; home all axes
    G92 E0 ; zero the extruded length
    G1 Z10 ; lower
    G1 E20 F200 ; purge nozzle quickly&lt;---------Change E20 to E3, E is the extrusion length
    G1 E10 F60 ; purge nozzle slowly &lt;----------Remove this line
    G92 E0 ; zero the extruded length again
    G1 E-1.5 F400 ; retract
    G1 X170 Z0 F9000 ; pull away filament
    G1 X180 F9000 ; wipe
    G1 Y20 F9000 ; wipe
    G1 E0 ; feed filament back


The rest of it is just moves to try to clean the nozzle.