This came across the forums and thought this was a great question and deserved a spot in the FAQ's..so if you'd like to have ink and paper (saving you precious time and money).....
Step # 1 - Log into your Paypal Account
Step # 2 - Click on Merchant Services
Step # 3 - Click on Shipping Preferences
Step # 4 - Click under the to "U.S. Postal Service Preference
" click on "edit printer settings
Step # 5 - Unclick the "print receipt" box