Matias/ALPS compatible keycap with a spherical top profile.
This deep-dished 1.5S size keycap is suitable for the home row of your keyboard. At 1.5 times the single key width, this key is best for modifier keys.
Based on the DSA family from Signature Plastics but 3D printed with a 1Z mount (but the mount is flush with the bottom of the keycap to make it more suitable for 3D printing.
The center mount is connected to the edges by 4 posts that support the post so it is fully supported during printing. These posts have a small notch at each end, so they can be quickly and accurately clipped off using side cutters before fitting.