Guitar string presser / finger saver for beginner

I want to learn guitar but it makes my finger hurts, so I make this thing.

Not guarantee to work on all guitars, since I only have a cheap one (best choice products 38in beginner acoustic guitar).

Print is easy and fast, no support needed. But assembly may take some effort especially putting the cap on with the spring.

I use the spring from one of those multicolor pens. They are a bit long and I cut the spring in half and is able to make 3 pieces out of it.

If the fit is loose you can put a piece of rubber in between to make it tighter. 

Be careful when putting it around so it doesn't damage your guitar.