Ender 2 x-axis y-axis belt tensioner

This is a remix of [CR-10 x-axis belt tensioner by Gavitka](https://www.thingiverse.com/thing:2491551), Gavitka's model fits perfectly for x-axis on the Ender 2 printer as well as CR-10. However for the y-axis on Ender 2 it needed modification so it wouldn't hit the bed.

I shortened the top side for the frame and the cap. Then I added a knob, from [CR-10 X-Axis Realigned Tensioner by jneilliii](https://www.thingiverse.com/thing:2417659), which I really like.

This model work for both x-axis