All rods can be scaled as needed and are 190mm long (7.5"). These can be sliced smaller in Microsoft 3D builder software (free)
Printable building rods include:
2mm 3/4 round
2mm angle
2mm channel deep
2mm channel narrow
2mm 1/2 round
2mm hex hollow
2mm octagon
2mm pentagon
2mm 1/4 round
2mm solid rod
2mm square rod
2mm square tubing
2mm tubing
2mm Z
2mm H
2mm T
2x4 mm tubing
2mm triangle