There are many ways to connect your Printabloks for different situations.
H-type connectors are for general usage.
T-type connectors are tighter and were designed to be used in places where a single connection will be holding a lot of weight. They may need a little extra effort to get them in place, but once in place they remain in tension the whole time and will thus hold better.
S-type connectors are "slip" connectors and only hold on one side, Suitable for when you want PrintABloks to line up, but not necessarily to stay where they are.
ST-type connectors are a modification of the slip connectors that hold the slip connection a little more securely and were created specifically for blind PrintAQuest.
V-type connectors are designed to be printed using vase mode and are mostly used for when you want to scale up PrintABloks. Regular connectors lose flexibility, but vase mode allows the creation of connectors that work at any scale.
No special settings are necessary, but connectors tend to work best when printed in PetG at 0.16 mm layers or less.