Prusa linear bearing LM8UU – set of 12 pcs

Linear ball bearings LM8UU are the standard for guide rods with a diameter of 8 mm in many 3D printers and CNC applications. 1 piece of the original bearing used in Original Prusa printers is ideal for a complete replacement of all bearings in the entire printer or for building a new design.

The bearings are pre-lubricated from the factory, no additional lubrication is required before installation. Thanks to precise dimensions and high-quality workmanship, they ensure stable guidance, reduced vibrations, and smoother movement of the print head and build plate.

Main benefits

• Original LM8UU for 8 mm guide rods – compatible with most 3D printers using 8 mm rods
• Dimensions 8×15×24 mm – inner diameter 8 mm, outer diameter 15 mm, length 24 mm
• Bearings pre-lubricated from the factory – no need for additional lubrication before installation
• 4 rows of balls – good load distribution and stable running
• Steel body with grooves – easy fixation in holders and bearing seats
• Proven use in Original Prusa, DIY projects, CNC, linear motion mechanisms, etc.

Typical applications

• Spare part for Original Prusa 3D printers (series MK2, MK2.5, MK3, MK3S/MK3S+, MK4, MINI/MINI+ and other models with 8 mm rods – always check the specific bill of materials for your model)
• Linear guidance of axes X, Y and Z in 3D printers
• Guidance in CNC machines, sliding mechanisms, plotters, laser engravers
• DIY projects using 8 mm linear shafts

Technical specifications (1 pc bearing LM8UU)

Note: Dimensions and design correspond to the standard LM8UU bearing commonly used in Original Prusa 3D printers.

Tips for installation and maintenance

• Before replacing the bearings, check the condition of the guide rods – they should be smooth, without grooves and corrosion.
• Press the bearing into the plastic or metal holder evenly, without twisting – ideally using a vise or dedicated tool.
• After installing the bearings and rods, verify that the carriages move smoothly over the entire length without sticking.
• Additional lubrication is required only after extended use, according to the printer manufacturer’s recommendations.

Key features:

• Original LM8UU type used in Original Prusa 3D printers
• Standard dimensions 8×15×24 mm for 8 mm guide rods
• Bearings are pre-lubricated from the factory – immediately ready for installation
• 4 rows of balls for stable and precise linear movement
• Suitable for 3D printers, CNC machines and other linear guides