Grease Gun Project v2 (less sharp)

I remixed the original Grease Gun from LastDragon to make the corners less sharp and more comfortable to use. So, I just rounded some corners and changed the grip patterns.

Big thanks to the original author! It is very useful.

#### Description from the original:

> I found that a meat syringe from aliexpress (like this https://ru.aliexpress.com/item/-/32959980465.html) is very useful as a grease syringe/gun, but it is not so easy to refill it from the standard grease tube. This thing solves this problem.
>
> V2 Improvements:
>
> better usability
> better cap design
> easy to clean
> For tube with:
>
> OD: 53 mm
> Wall: 0.9mm