It's the classic tunnel through a giant tree made big enough for trains and also has a giant log tunnel.
The stump is 46.5mm tall and the log is 82mm long. Easy assembly log kit has two ends and the tunnel, just match the ends to the different log ends and affix with your adhesive.
The tunnel opening is about 40mm tall by 30mm wide.
Has normally expected 3D printing process artifacts present, material used is brown Flash Forge PLA+