use pet tape, heat bed to 60-70c and when bed cools prints just lift off.

Most prints will lift at about 30c.

Much warmer than that and the pla is still soft.

So far I've had some realy great results with this combination. Only thing that hasn't worked is a chainmail bracelet.
They always printed - sort of - on blue tape but tended to break when trying to remove.

I'll keep fiddling.
But other than that - clean, flat non-warped prints. And a roll of tape will probably last years. As so far I haven't had to touch it with a scraper.