One thing I've found to be critical to successful bonding of the initial layers is strongly applied tape. For my initial prints I was simply rubbing the tape down by hand which doesn't bond the tape well, and is likely to leave behind traces of oils from your hands. I switched to using an old credit card to apply the tape and had a lot less issues of the first layers getting a good bond to the bed. This 3D printed applicator will help you to ensure strong adhesion of tape on the print bed. Due to the harder edge than that of a credit card, it will also "rough up" the surface slightly, also helping with adhesion.
###Update 9/23
Updated part file to correct scaling issue in the STL file.