Hello 
This tutorial represents how to use standalone gazebo plugin and ROS packages for gazebo.
Also this update includes new models such as TurtleBot3 Waffle Pi and TurtleBot3 House
and one more thing…
You can find it below video 
Is your laboratory, house or office too big to SLAM by TurtleBot3??
Then now you can take it more!
[Github]
[Wiki]