1SD ALPS/Matias compatible DSA keycap

Matias/ALPS compatible keycap with a spherical top profile.

This deep-dished 1S size keycap is suitable for the home row of your keyboard. With a 1.6mm dish, this key is best used as a set of 4 per hand, to allow you to find the resing position of your fingers, without needing to look. 

Also available with a location "bump" for the index finger position of the home row (`f` and `j` on a QWERTY layout): 1SD-bump

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.