Release film replacing device and 3d printing apparatus

A 3D printing apparatus, wherein the 3D printing apparatus comprises a release film replacing device and a rack, wherein the release film replacing device is slidably connected to the rack;

• and
• the release film replacing device comprises a winding assembly, the winding assembly comprises a first reel and a second reel;
• the first reel and the second reel are oppositely spaced apart and both configured to be rotatably connected to a rack, the first reel is configured to wind a first end of a release film, and the second reel is configured to wind a second end of the release film;
• when the second reel rotates about an axis of the second reel along a first direction, the first end of the release film is unwound relative to the first reel and the second end of the release film is wound relative to the second reel.