This model is designed to help you dial in the most critical calibrations for 3D printing accuracy. It’s especially useful for anyone setting up a new printer or tuning their slicing profiles for precise fits.

The part is compact, quick to print, and beginner-friendly — designed entirely in Onshape. It includes the following calibration features:

🔧 What You Can Calibrate:

Flow Rate: A thin wall section (0.5 mm thick) lets you verify extrusion accuracy using calipers.

XY Hole Compensation: Four round holes allow you to measure and adjust slicer settings for hole sizing.

Shrinkage Calibration: The center-to-center distance between holes is 2.75 inches — any difference indicates part shrinkage.

Skew Correction: Use diagonal measurements to detect axis misalignment if your X and Y are not exactly 90°.

📏 Model Reference Dimensions (for calibration):

Outer Block Size: 4.00 in × 4.00 in

Hole Center-to-Center Distance: 2.75 in

Hole Diameter: 0.625 in

Raised Circle (Outer Diameter): 2.50 in

Flow Rate Wall Thickness: 0.50 mm

This is a functional calibration block for precision tuning — not meant to evaluate overhangs, visual artifacts, or seam quality. It’s especially useful for Klipper users (with skew correction) and anyone working toward highly accurate mechanical parts.

Let me know in the comments if you'd like to see a version in metric units, or one optimized for other printer sizes!

SKEW CORRECTION IN KLIPPER

[https://www.klipper3d.org/Skew_Correction.html](https://www.klipper3d.org/Skew_Correction.html)