CREALITY Ender 3 S1、S1 Pro Z-axis upgrade linear rail installation guide.
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Upgrade Ender 3 S1 and Ender 3 S1 Pro Z-axis linear guide positioning fixture STL file download link: https://www.thingiverse.com/thing:616.... It's recommended to print 3 or 4 of them. Start using them at 14 minutes and 32 seconds in the video. Use the platform board and Z-axis profile as references to position the linear guides.