MK3s Extruder Carriage for Bear X-axis [RJ4JP Mod]

Description

Though my initial design for the R4 series prusa MK3s extruder carriage for the Bear X-axis has served me well, using it with Igus RJ4JP bushings gave too much play on the extruder for my liking. This modification takes my initial design but tightens the bearing slots both for length and diameter to provide a snug fit around the Igus RJ4JP bushings. The bearings now snap in place in this carriage and can no wiggle around as was the case with the default cutout dimensions used in the Prusa designs. A few modifications to aid printability are included as well but otherwise have no impact on the functionality of the part. <b><u>Note:</u></b> As with the original carriage, there is the posibility to over tighten the back, causing the polymer bushings to bind up. You'll need to play around with the screw tension when tightening the back and ensure the carraige can still move freely. (The parts do not need to touch to get a play-free mounting of the extruder).

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