Haha, I know! It can be really be a challenge!
For me, it worked by laying her in the middle of the room. The bed may work for a smaller snake.
Get a string, or cloth tape measure, and once they are stretched out, even though moving, just mark the spots a few inches parallel to their head and tail.
If you measure too close to their head they may shy away. So if they are moving pretty good, there is some guesstimating involved.
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