Tunnel IKEA/Brio railway

thingiverse

Printing PLA plastic or any other low-temperature material without support requires some extra effort. After printing is complete, the roof of the tunnel needs to be carefully immersed in hot water and shaped accordingly. Even with moderate heating, it becomes remarkably pliable. Don't worry about making mistakes – heating and bending can be repeated multiple times as needed. Just remember to handle your hands with care to avoid getting burned.