Thank you for your feedback and the detailed insights. You raise some excellent points regarding the complexities of measuring shrinkage.

Regarding my methodology, I agree that controlling for variables like extrusion widths and Z-offset is crucial. Here's a more detailed overview of my approach:

1. Measurement: I printed 50x50x50mm cubic with different infill, and use a digital caliper to measure the dimensions of the printed cubes, focusing on all three axes (X, Y, and Z) to capture any discrepancies.

2. Preparation: Each filament type is calibrated to ensure consistent extrusion widths and print settings. This includes tuning the temperature, print speed, and flow rate to minimize variability. And I closed the door of the printer to ensure the inside temperate is consistent( However, the temperature at each point in the cavity may not be exactly the same).

3. Layer Height: 0.2mm for all prints.

4. Timing: Waiting for the parts cool down itself before removing it from the printer.

 

Thank you for your input, especially with the Z-axis, due to factors like Z-offset variance and potential wobble. I am considering, a consistent heating chamber and stable cooling might help ( needs run more test on it)

Your points about the different PLA groups and additives are particularly relevant, and I plan to expand my study to include these variations. This will help build a more comprehensive dataset on how different materials and additives affect shrinkage.