GCodeSimulator - 3D Printing is a free simulation app that allows you to visualize 3D printing gcodes and simulate the 3D print. It can also connect to many 3D printers using USB-OTG cable (or Bluetooth) to control the printer. The app shows how your print will look like, allowing you to check your print upfront, making it easier to spot errors and fix them instead of wasting filament. It also allows you to use any Android tablet or phone as a touch screen for your 3D printer.

You can use the app to check out your print, which is one of the most important steps in the 3D printing process. You can also use it to control your 3D printer and to check out the print.

The app is a free simulation app, so it doesn't need to worry about any payments or costs. It is completely free to use, and you can download it from the Google Play Store.

You will need to install the app first, and then you will be able to use it.