While I enjoy Cubic profile, it’s on the thin side and spacebar is where the downsides of thin keycaps come out in full force: high pitched rattly cheap plastic sound and hollow feel.
I had some 5mm thick Sorbothane sheets around so I cut up two pieces sized to fit in two empty areas inside the spacebar keycap then [crazy-]glued them on.
YMMV but expected effect of this mod are:
- lower pitch sound
- cleaner sound profile (less rattle)
- more solid feel.
I liked the result so much that I may try this with other keycaps also, starting with longer keycaps first.
WARNING: Sorbothane is sticky and crazy-glue part may cause irreversible damage so just try without the glue first.