Plus-Plus is a building toy that takes these puzzle piece like blocks that can link together to create fun models. These 3D modeled Plus-Plus pieces are compatible with official Plus-Plus pieces.
I cannot post pictures of Plus-Plus creations because they are not my own pictures. You can look up Plus-Plus on google if you would like to have some ideas.

I am NOT associated with Plus-Plus, I have just recreated their product in tinkercad, and if you wish to edit the model you may do so here: https://www.tinkercad.com/things/1P8etKgiRAp

Plus-Plus official website: https://www.plus-plus.us/