Ender 3 Pro Front Drawer

I designed this drawer from scratch based on [original design](https://www.thingiverse.com/thing:3162464) for these reasons:

- To make better use of bottom space between left main board case and right frame structure (the drawer have 145mm x 125mm external size);
- To be hooked up from the left rail of Y axis frame;
- To use less support material and thinner walls (also included a 2mm wall version STL file);

Fits perfectly on Ender 3 Pro. Enjoy!