Getting PLA to stick that works for me

I had trouble with the blue tape, maybe I bought wrong brand /shrug.
I only have the PLA version of the Robo 3D printer.

But this method work well for me.
Went to Home Depot and got some Deco Mirror tiles with plain edges, all they had were 12x12 inch.
Make sure the mirror is good quality with no ripples that you can see.
Bought a 6 pack of the tiles for about 10.00
Bought a glass cutter kit for about 13.00 get the kit that has the cutter oil.

Cut the mirrored tiles to fit your needs and attach to Robo 3D bed, I used blue tape.
Adjust your Z axises to match the tile height of 2mm

Use Aquenet hair spray, very light coat and let it dry completely.

The PLA sticks well and it is easy to remove from the tile with a circuit spatula.

Hope this helps.