Bambu A1 mini Z-axis topper to prevent cable/filament tube from snagging on the top of the Z-axis. I cut out a small piece on the front to clear the nub sticking out on the front (see photo). With this removed, the cap fits snugly. I may update this once I modify the design to incorporate this.
Update (June 12, 2024): I have uploaded a modified version with angled notch to better fit. I hadn't noticed others already modified the original before I did the same, but here it is anyway. The notch has an angle designed into it to more snugly fit.
Feel free to modify as needed.