You can use this LM8UU bearing holder on your X and Y axes.
It will save you a lot of mass, and allow you to print faster.
The whole thing weighs just 4-5 grams.
Use 2 zip ties to secure the LM8UU bearing in place, and M5 nuts.
You can use just 2 nuts per bearing - no need to use all 4 - it works just fine that way.
The design works with IGUS bearings too (not printed imitations!). Tested & confirmed.
Suitable for Prusa-style printers e.g. Anet A8 etc.
Check out http://lokspace.eu for more of my projects & designs!