Update README.md

README.md

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 ### 1.2. Ender3 Bed into slicer
 
 1. To add Ender3 bed to slicer preview copy "ender3_bed.stl" to instalation directory, often at "C:\Program Files\Prusa3D\PrusaSlicer"
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 Taken from: https://www.thingiverse.com/thing:3873312
 
 ## 2. Hardware