This mount should be able to connect onto most spray cans with a ~24.3mm interior diameter. Unfortunately you MUST use support material! Please make sure you know the right support settings for your printer. You should be able to use a standard hobby servo to press down the nozzle, but a high torque servo would be preferred for less wear.
Update 4/17/16: I realized that Autodesk was causing the gap between the can mount and servo plate to be hollow, and making the connection weak. I have since updated the model to make it much more strong. Apologies to anyone who experienced issues with this!