It’s time for challenge 2 
What you’re building
A parametric model of a lemniscate. It’s a figure-eight curve whose shape is controlled by three independent driving parameters. The real test isn’t just modeling the shape. It’s making sure your model transitions cleanly from State A to State B by changing only those three parameters, without breaking constraints, inverting, or deforming uncontrollably.
If your model holds together through both states, you’ve done it right.
The rules
Fixed dimensions: A Driving parameters: B, C, and D Driven dimensions: any construction lines, points, or dependent curves needed to keep the shape stable
Important: your design history tree must contain only Sketches and Extrusions. Any other feature type results in an automatic fail.
Submit your CAD file through this link by the end of the week on Sunday, July 12.
Your results are going to be shown on the leaderboard after the submissions are evaluated.
Scoring reminder
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Complete the challenge → earn 10 completion point
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Complete the challenge successfully → earn 6 success points
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First 5 people to submit gets → 5-4-3-2-1 points
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Stay consistent across the challenge → after 3 participations you get 3 extra points, after all 5 participations you get additional 10 points
As usual, questions are welcome here. Good luck!