First Layer Issues/Prints Not Sticking to Bed

Image from Prusa blog.

Unlike the Makerbots, many open source printers such as the Prusa and Ender 3 allow the model to be directly printed on the build surface instead of a raft. This means that first layer height are usually critical to ensure that prints are well stuck to the bed yet not too close that it would cause elephant foot effect.

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Prusa KnowledgebasePrusa Knowledgebase

First layer issues