You can add start and end scripts to your printer by creating G-code.

This page gives you the The 10 most common G-code commands for 3-D prinitng

You can also research G-codes on the RepRap Wiki

This has some cool end code snippets

And this Cheat Sheet from Thingiverse is cool.

Clean your nozzle before printing

• G90 ;Move in absolute mode
• G1 X0 Y290 F400 ; Present the printed part ready for removal

I added this right before the;

M84; Stop the Stepper Motors

Command.