Here is a compact 3D printer with a full metal body selling at an affordable price: the Root 3D printer gives you easy access, so you can get started with printing easily. You can use a SD card to start printing. It is always possible to connect your computer to the device to get started. You will be able to see your project from all sides, enabling you to catch issues as your printer goes to work.
The Root helps you produce prototypes and experiment with your models. It looks solid and is selling for as low as $375, but you have to be an early supporter.