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It's tough. I've had the best luck by doing the following:

  1. Unroll a good sized section (a bit longer than you need by two inches or more)
  2. Fold the tape back over the roll (so the part you unrolled is now sticky side out)
  3. Press edge of tape just after fold onto the build platform (making sure to get the tape parallel to the platform)
  4. Use an X-A
    cto knife to cut the tape from the roll
  5. Roll the tape roll (which I'm still holding the cut piece to) across the platform

This does a great job of avoiding major bubbles. I often get a few small ones, but it's not that bad. This tends to work really well. I did a better job by hand (once), but m
ost of the time I ended up messing up.