Used it to make a Greco style structure for my ivy plant to grow own. Model looks and prints great! I designed some printblok-comptabile horizontal blocks and made a stack of 3 columns tall, and topped it off with a couple statuettes.
I think it looked really good in the marble PLA.
The prints initially were SUPER sturdy and snug with the printblok connectors, and I had confidence in their stability. PLA was not the correct choice to use here though - the connectors grew more brittle and the structure got floppier over time. Probably also should've used 3 columns for a stable triangle rather than just two, and it had to be propped up. I still really like the concept though, and might reattack in the future. (edited)
@AlanVolny_527379 Looks very nice! Thanks for posting this, happy to see people use it. The strength of the connector is a known problem. I have tried a bit oversized connectors printed from PETG. It helps but does not totally solve it. For builds no need to disassemble, like my birdhouse, I used a dot of superglue when the design was final.