I recently started the process of creating a bridge. In an attempt to deviate from a classical bridge design I came up with a design where a carriage follows a raised screw across a gap. I designed a gear system to rotate the screw. The bridge was designed in Tinkercad and 3D printed. A few problems arose, such as the low pitch of the screw making many rotations necessary to bring the carriage across. Additionally the gears had poor contact and often slipped. To solve these problems, a new screw with a larger pitch will replace the current one and gears with larger teeth will be used to improve the contact of the gears.