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# Why you should heat up your nozzle and bed before bed leveling

### Why should the nozzle and bed be heated beore bed leveling?
The bed and nozzle should always be heated up before leveling, since the heat will make both expand.

See this video for more details and a showcase of just how much it can affect your leveling;
${youtube}[Does a Heated Nozzle Expand and Mess Up Your Bed Level?](MNVCDNW0RoU)