My first 3D printing - I need some advice or tips It is my first time for 3D printing, I read some tips for forms, minimal thickness, angles, round or flat, but I am still not sure if I am going to do all well for the first time.

For my college final project, I had to make a small prototype and it requires an enclosure.

My concerns are:


I am not sure if my design will require supports
Overhangs 
Printing Orientation


Here part of my design:


Most walls are 2&nbsp;mm+ thick
The lid is a separate file, but it is really simple just a flat rectangle, I believe it is going well the first time
I see this:


  I had to make a small prototype and it requires an enclosure


and this:


  yes, it is hollow inside


How do you intend to get your item inside the result? This part really needs to be two pieces with two separate prints. Basically, a box and the lid, where you leave space for screws, include tabs, or plan for glue connections.

Finish that alteration, and the support issue suddenly becomes much easier. Most slicers have options to generate support for you, including limiting support to spaces between the model and build plate. Now you can rotate the angle at the which the part is printed in order to minimize your support needs, or so that most of the connection points for the support will not be visible in the finished product.