In early 2023, I went back to an idea I had in 2016 to make a modular daisy out of bent modules, all connected in the center of the flower. My first attempt failed since at that time I was not able to design a lock strong enough. When I revisited the idea, I was able to design the lock quite quickly, and it holds well.
Units can be folded from elongated rectangles of arbitrary proportions. Theoretically, anything more elongated than a square should work, but only aspect ratios starting from about 3:1 seem practical, depending on the paper used.
Since the units’ flat parts that connect in the center are aligned perpendicular to the model’s plane, any number can be used to make a model, provided you can squeeze them tight enough. For this fold, I chose to use 15 units since folding from A4 sheets cut in three lengthwise (aspect ratio of 1:3√2 ≈ 1:4.2) resulted in nice proportions. I also like modular origami made from an odd number of modules since such designs are relatively rare.