Frequently Asked Questions

Q: Do I need polycarbonate (PC) bearing treads or plain chrome steel bearings?

A: PC treads have lower rail wear and are quieter, used for example on the X & Y carriages of a 3d printer that experience thousands of cycles. Plain steel bearings have a higher load rating and roll smoother, used for example on the Z carriages that have more preload and less movement.

Q: How many slides do I need for each rail?

A: The slides are sold individually, and four are generally needed for a stand alone rail. See the guide How Many ExoSlides Do I Need?

Q: Will they fit all 2020 extrusions?

A: For the vast majority, yes, if the width of the extrusion falls between 19.85 and 20.05mm. The slides have adjustable bearing preload to match these cases.

Q: How noisy are they?

A: The polycarbonate treads are very quiet. The plain steel bearings are also surprisingly quiet.

Q: Do they wear the aluminum rails?

A: The polycarbonate threads are softer than the rails and will wear first. The plain steel bearings do leave marks on the rails, with wear proportional to bearing preload and cycles.

Q: How strong are the slides?

A: Each bearing location can hold 75N radially. When four slides are used around a rail, each side has 4 bearings, and each face can hold 300N (30kg or 66lbs)!

Q: What about replacement parts?

A: The polycarbonate treads and steel bearings are sold in packs of four.

Q: Are more slide sizes available?

A: The 20mm is our first offering. Other sizes will be available soon!

Q: What are the brackets parts for?

A: The brackets can hold a rail perpendicular to the slide it is mounted to.

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FEA at 75N radial load. Displacement of 0.05mm at bearing loaction (zero displacement if preloaded to 75N).