Hi, thanks for taking the time. Here is the link to the Bridge (‘Download Bridges’ -> open the zip -> Bridges -> Rocket3FtoBlender.zip which you need to install in Blender addons):
https://www.rocket3f.com/kunena/updates/5423-bridge-to-blender
It works by copying an object in Rocket 3F and than pressing F4 in Blender and import it (Rocket 3F Clipboard). While exporting from Blender you begin by Pressing F4 and export it and than paste it in Rocket 3F.