I wanted to make the Y axis of my new printer simpler. So I decided to give it a go with linear bearings.

I am pretty happy with it so far, it's running quite smooth. I only need to find a way to make the bed move the full length, by either putting the rails a bit up or adjusting the design a bit.

[www.thingiverse.com]

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reprapworld.com
PLA, ABS, PETG multiple colors (3 and 1.75 mm) €16,49 / kg
Megatronics 3.0 €79.99 / Minitronics €37,19

I have updated the design, I have added a spacer object. Also instead of having the Y-axis bars under the frame bars, I have put them on them.

I think it has a really low friction as I tried to demonstrate in the vid: [www.youtube.com].

My only concern is that the bearrings have some room to move inside the bearing housings. But that might be easily fixable with some toiletpaper or something.

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reprapworld.com
PLA, ABS, PETG multiple colors (3 and 1.75 mm) €16,49 / kg
Megatronics 3.0 €79.99 / Minitronics €37,19

Maybe you have missed this, but Prusa Iteration 2 has the same layout with a single sheet of ply/MDF for the bed, see: [blog.reprap.org]
Also, there are lots of variations of LM8UU Y-axis holders: [www.thingiverse.com]
Personally, I use my own variation of this holder: [www.thingiverse.com]