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Hybrid Roller Slide

dkennell
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Published on April 22, 2012

Derived from

Pocket Printer Upgrade - hybrid roller slides
by dkennell

Description

Make your own slides on any dimension aluminum extrusion. This slide is simple to print, and easy to assemble. It uses a combination of printed slide surfaces and RC car bearings for very low friction. Use a pair of them with your carriage. I am running them on my Pocket Printer with good results.

Instructions

Print in pla, which has very good wear characteristics. You may need to make some adjustments to the dimension of the printed slide surfaces to get the fit you desire. The dimensions between the bearings is 0.2 mm less than the extrusion width. The slide flexes slightly to give a preload to the bearings. You can adjust for you own preferences.

See the pdf assembly drawing for critical dimensions and instructions. There is also an exploded view of an application on the Pocket Printer page.

Use 623ZZ bearings (3 x 10 x 4), you can get a 10 pack for under $10. You also need M3 x 20 screws and 3 mm washers.
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karandex on April 26, 2012 said:

can you add a second bearing so it will be more constraint. it looks like the downward force will create friction with plastic. it needs bearing in bottom like roller coaster.

MintingMill on April 26, 2012 said:

much needed part. thanks Dave!

wilson on April 22, 2012 said:

whosawhatsis that's a good idea. I've been playing around with printed bushings on aluminum extrusions, but it can get a little bindy. Just found this place that sells different thickness uhmw tape. I think I'm going to order some to play with. http://www.eplastics.com/Plast...

whosawhatsis on April 22, 2012 said:

80/20 sells pads of UHMWPE for sliding on extrusions. Among other impressive properties, it's self-lubricating, has a coefficient of friction comparable to PTFE, and is up to 15 times more abrasion resistant than carbon steel. I've been planning on testing UHMWPE tape over printed forms for linear guides on aluminum extrusions. An additional benefit of using it in tape form is that it will be apparent if the thin layer of UHMWPE does become worn, and it can easily be replaced even if the wearing is bad enough to impair printer performance. Have you considered this material at all?

dkennell on April 23, 2012 said:

I have not tried that, but it sounds like it could work. In my experience, smaller contact area is better and results in less friction. Let me know how it works when you try it

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Hybrid Roller Slide by dkennell is licensed under the Attribution - Creative Commons license.

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