Pen / Pencil Tray

This is the first thing I designed a few years ago experimenting with Tinkercad, even before I got my first 3D Printer and got into 3D Printing about a year ago from the creation of this post. It's a simple design for a Pen / Pencil tray. I needed something to prevent my pens and pencils from rolling away whenever I used and set them down. Since I didn't have a 3D printer back then, I used Shapeways.

The original dimensions are X = 127mm x Y = 177.8mm x Z =12.7mm.

Scale as you see fit.

Tips are greatly appreciated. :-)