1S (with bump) ALPS/Matias compatible DSA keycap

Matias/ALPS compatible keycap with a spherical top profile.

This standard-dish 1S has a small, raised bar at the front of the keytop, so you can identify the key by feel alone. Thi size keycap is suitable for any standard single keycap on a keyboard, but is normally used for the `f` and `j` keys on a QUERTY layout. It has a 1mm detent depth.

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. 

Also available as:

• a standard key with no bump: 1S
• a 1.5 width standard key: 1.5S
• a double width key: 2S

This keycap is similar to the dox keycap, buit with an alps-compatible, rather than cherry-compatible key fitting.