3D printing conveying platform and 3D printer

A 3D printer comprises a print head assembly, a print head moving frame and a 3D printing transport platform, the print head moving frame being disposed on the 3D printing transport platform, and the print head assembly being disposed on the print head moving frame;

• wherein the 3D printing conveying platform comprises:
• a conveyor belt;
• a drive assembly driving the conveyor belt in a first direction;
• a base, the drive assembly is mounted to the base;
• a follower assembly, the follower assembly is disposed opposite the drive assembly in the first direction, the conveyor belt is drive connected to the follower assembly;
• and
• a movable assembly comprises a first movable member and a second movable member connected to each other, wherein the first movable member connects the follower assembly, the second movable member is movably disposed between the first movable member and the base and connected the first movable member to the base, the follower assembly is configured to be oscillated in a second direction with respect to the base, the second direction intersects the first direction;
• wherein the movable assembly further comprises a catch pin, one end of the first movable member is fixedly connected to the follower assembly, and another end of the first movable member is rotationally connected to the catch pin;
• and one end of the second movable member is fixedly connected to the base at one end, and another end of the second movable member is rotationally connected to the catch pin, to cause the follower assembly to swing around the catch pin.