I've learned some Blender and using it to model geometries with 4 isosceles triangles folded into tetrahedrons. The triangles are not intended to fold into complete, closed tetrahedrons. I'm hoping to get triangular meshes along the x and y axes to 'snap' together so further objects may be added to the construction.
I would be grateful to find a well supported, powerful, open source tool.
Where should I look, or what topic may be most relevant for me to explore to get this step done?