3d printing: Hmmm, maybe a raft is not the answer

As a complete beginner to 3D printing, stumbling around in the dark feeling for snippets of understanding, the current plan is to find out why my 20.0mm object print at 20.7 tall, and the one that should be 10mm tall comes out at 10.7mm. In scooting around YouTube, I have seen folk print on a ...

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from Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/3d-printing-hmmm-maybe-raft-not-answer-2018-09/