The PFF-X7/E3 Earthree Gundam (アースリィガンダム?) is a Gunpla appearing in Gundam Build Divers Re:RISE. A variant of the PFF-X7 Core Gundam, it is built and piloted by Hiroto Kuga. It is known as PFF-X7II/E3 Earthree Gundam when used with the PFF-X7II Core Gundam II.

Through the PLANETS System invented by Hiroto, the Core Gundam can dock with the Earth Armor support mecha to form the Earthree Gundam. Its basic capabilities are improved and its armaments have become more powerful. It is most effective when used with a basic battle style and can adapt to missions involving various situations. Hiroto has been using this Gunpla for a long time, and his consistent maintenance has allowed it to keep its blue color and excellent capabilities. The Earth Armor remains compatible with the upgraded form of the Core Gundam, the Core Gundam II, and the resulting unit retains the name of Earthree Gundam.