Those are nice. It looks like some interlock, but most look stand alone. I don't like a few things about those designs related to not being as compact as possible. Prices are a maybe a little high. I can print them for under that in material cost using an industrial printer with nylon/carbon fiber. Which is overkill, but it's what I have. Someone could probably buy a low end printer for $250 and print my files $1-2 each using a cheaper material. So a few trays at $20+shipping would pay for a good portion of the printer cost. I'd rather encourage that and share my designs. I really don't want to get into printing these as a business. I'll do it as a favor if you don't have/can't buy a printer.
Anyhow I've been busy with the kids events lately, so haven't made much progress but I'm getting back to it now. I have been using what I have so far and I'm loving it. It is almost fun to pick thing up and put them back exactly where they belong. I'll keep updating my progress and when I'm happy with the designs I will share all the files. The Hanna checker is next on my agenda.
The drying stand is one I really need !