Improved Flow Calibration v2

Here's improved flow calibration compared to Orca or Bambu Studio. This is the second iteration from the original model: Improved flow ratio (extrusion multiplier) calibration v1 by jimcorner - MakerWorld

Why I upload this:

1. the default flow calibration is bad at telling which flow rate has the smoothest surface with the monotonic top infill pattern, especially for white filaments. The result is often very subjective.
2. There are too many test pieces to keep track of

What's improved compared with Orca/Bambu Studio:

1. The top surface is concentric pattern instead of monotonic, making it much easier to tell which flow rate is the best and take out a lot of the guess work. All other settings are exactly the same as Orca Slicer, so you know the calibration print is set up exactly as originally intended.
2. The test pieces are put together as one piece, instead of 10 smaller pieces that tends to clutter up my space and it's easy to get lost.

How to use this:

1. open the 3mf file in orca slicer, and select the filament you want to calibrate.
2. Pass 1: change the flow ratio of that filament to 1.0, slice place 1 and print. The flow ratio of the 7 pieces are: 1.12, 1.08, 1.04, 1, 0.96, 0.92, 0.88
3. Pass 2: find the best smooth surface flow_rate_rough, and put this number in your filament flow ratio, and print the second plate. The flow ratio of the 7 pieces are: 1.03*flow_rate_rough, 1.02*flow_rate_rough, 1.01*flow_rate_rough, 1*flow_rate_rough, 0.99*flow_rate_rough, 0.98*flow_rate_rough, 0.97*flow_rate_rough
4. find the test piece with the smoothest surface and put it in your filament setting, and you're done.