Bearings in one print

Here is bearings that I started to design a while ago.
They are easy to print and do not require support.
There are two different versions depending on the need:

• V1: single roll -> low friction, and rather high speed
• V2: double rollers -> better guiding and resistance but more friction

Material : PLA or ABS is ok
Infil : 20% is enought

Note 2: I will make videos to show you the bearings in operation

Feel free to give me your feedback :)