"Thanks Jeremy!  We find that gluestick is still useful, even with a heated bed made of PEI.  It's a function of using a relatively "high" z-offset on our printer.  A low starting z-offset let to great first-layer adhesion without glue or blue tape, but the cost was a smushed and flattened first layer that made it more difficult to remove interior supports.  Adjusting the z-offset upwards lead to better first layer print quality, but worse adhesion."