The TOS-1A is an improved version of the TOS-1 Soviet developed multiple rocket launcher mounted on a T-72/T-90 tank chassis and capable of using thermobaric warheads. The system was tested in combat during the Soviet-Afghan War in 1988-89. The TOS-1A latest version introduced in 2020 has an extended range of 10 kilometres and a better ballistic computer. It is fitted with a rotating launch system for 24 unguided thermobaric rockets that can all be launched within 6 to 12 seconds.
The 3D printed model is from Zeus Model and is very fine. I just added some detailing on the rear of the launch tubes, some crates and light battle damage.