You will see a lot of pictures of printers printing onto blue tape. This is most likely because they have a glass bed. Glass has the advantage of being cheap, and very flat. They can also be used for heated beds which makes printing ABS, nylon, and other high temperature warp prone materials easier to handle. But adhesion to the glass is nearly impossible. To improve the adhesion people use blue tape.
In my small experience with printing on blue tape, I noticed less bed adhesion than with acrylic. Which makes acrylic an excellent choice for PLA. Which does not need a heated bed. I do not have any experience with a heated bed. Though this will be my next upgrade so I can print with nylon.
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R. Kyle Gress
gMax Technical Support
3D Printing/Electronics Enthusiast