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SummaryPrusa i3 and derivatives are using 20mm between support holes for the bushings. Most people will use these holes to ziptie the bearings to the carriage. Recently I was in a build were that was not an option as I needed the carriage to be way above the smooth rod, so I created this part. It will allow you to ziptie the bearing to the holder and the holder has nut-traps for M3 that with 12mm M3 screws will allow the part to be securely fixed to the carriage.