Idea from ThaumicTom.

These are custom blocks. Place them in your blocks folder.

In-game, they can be found in block folders:
3-1-1-1-1
3-1-2-1-1-1

3-2-1-1-1
3-2-2-1-1-1

3-3-1-1-1
3-3-2-1-1-1

3-4-1-1-1
3-4-2-1-1-1

UPDATED: 2025-01-01
I've updated the set to fix the blocks since the game update in October 2024 that implemented triclips broke the ability to place these blocks. Please download the updated set here.