Welcome to R/3D Printing! Come for the Benchy, stay for the Calibration!

The original post: /r/3dprinting by /u/MorningtonCroissant on 2024-12-22 18:50:15.

I'm brand new to 3D printing, and my use case is for functional parts, adapters, etc., for woodworking tools. As a test case, I tried to print a rectangular solid that is 4.5 in. long, 1.5 in. wide, and 1 in high. The result is a solid that is 4.4815 in x 1.4185 in x 0.999 in. Obviously the height is near perfect, but I am surprised that the length and width were off by as much as they were (about 0.5% and 5%, respectively). So I'm wondering if this is within expected margin of error for my printer, there is something I need to calibrate, or if there are settings in Bambu Labs that I need to change when I need highly precise prints.

I used a Bambu P1S with a 0.4mm nozzle, Inland PETG+, with 0.1mm layer height, default line width of 0.5mm, and 100% infill. (I'm not sure if other settings might be relevant).

Any thoughts? Thanks.