These are a Panther tanks model at 1:200 scale. These models have a snap in turrets, i.e. after printing and cleanup just slowly push in the turret into the hull. It will snap in place and won't fall out.
They are based on m_bergman's excellent models from his 1:100 scale pack. The snap in joint is derived from the clone trooper model by danzca6 .
Print the turret as is for a better quality barrel. Print with the barrel pointing to the sky for less clean up and a stronger snap in joint.
Printed on the M3D micro.
5/2/2019 - Added Panther A and G models.
Be sure to clean out the supports between the snaps.
For a better resolution gun, print the turret parallel to the print bed.
For a quicker turret clean up, print with the gun pointing skyward. However, make sure your backlash is dialed in well and use a raft, or the gun may look all crooked.