Doing keycaps for me is a privilege, a pleasure and a fun hobby. However, I'm a full time student and have been really busy lately with university. I haven't completely stopped working on my pending projects, just couldn't stretch the time to put some hours in it.
I plan on keep developing the boobiecaps even as full sets in the future, so that's out of the question, as well as other pending keycaps I've got to ship to some people.
If time is not a constrain you'll receive your caps. As of today, I can make them in resin according to the original post, but that would be taking the easy way out. I posted this as an experimental idea to make squishy caps and that hopefully will survive the most demanding typer and that's what I'm aiming for.
Aside from the preorders, I invested a handful of resources to solve a problem, not just make another resin keycap, the real cloud of boobs, that I'm still developing. For your consideration, sourcing chemicals from Chile is an order of magnitude harder than in the US, and have to order overseas as the hobbyist market for makers/casting is almost nonexistent (2 providers that answer my emails, with scarce material list). It can be done, I do it all the time, but it takes more determination, money and time.
Status:
- Patterns (sculptures ready and clean, in wax)
- PU foam tested discarded as it compresses linearly(not spongy enough) and tend to collapse overtime. Latex would be better, but it degrades throughout the years.
- PU rubber works, tried, discarded, but it degrades over the years, as happens in the batman rubber suits for hot toys kind of figures.
- I've tried dental silicone, isn't flexible enough and breaks.
- Imported silane adhesive to adhere quarz fillers into the silicone. Got problems in the customs, but got it mixed in the origin and shipped.
- It's gotta be platinum silicone, but the batches I could get a hold of locally were probably bad, as every cast broke under minimum bend.
- I don't have another place to order platinum silicone in the whole country, that's the main ingredient I'm lacking. Will order it online, but run out of money. I'm not asking anyone for it. As I'm a full time student and have had been using my spare time with my expertise to earn some money doing custom hot toys heads (
http://i.imgur.com/KaVDyjQ.jpg). I'm still in the midst of doing a run of it, aside from other things, so I could order more materils and keep working on keycaps.
- I'll reopen the original post to showcase the final casts when I've positive developments.
Posibilites I've yet to try:
- Another silicone.
- Boobiecap top silicone, with an adhesive like 3M VHB tape and a hard resin switch interface.
- Just hard Resin.
pic attached of a bunch of discarded and approved molds, patterns, etc.
TL;DR If time is not a constrain you'll receive your keycaps, although you could ask for a full refund without trouble. You'll get them anyways. 
