Bushing

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Bushing

Vitamin

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Bearing surface with no rolling elements.
Wikipedia Bushing (bearing)

A bushing is a plain bearing (no rolling elements) that only provides a bearing surface. They are less noisy than linear ball bearing but not always practical to integrate.

Vendors

Vendor From Product Bore Material Additional notes
Goldmine US Bushing with flange 8 mm bronze Don't use on 5/16" rod.
Paoparts FR Iglidur D6 6 mm plastic  
Paoparts FR Iglidur D8 8 mm plastic  
Igus US many multiple    
TechPaladin US Sleeve Bushing 8 mm bronze Self-aligning.

UHMWPE bushings

One RepRapper has used Ultra High Molecular Weight Polyethylene to create self-lubricating bushings that are less noisy, but deform under load and have increated wear and play over time compared to linear bearings. More information in DIY linear bearings (no PLA) on the forum.