Update: 6x2 (240x80x80 cm) and 3x2 (120x80x80 cm) blocks added. 

These are the actual block models that I used to create my concrete casting forms (see also https://www.printables.com/model/234938-scale-interlocking-concrete-block-form)

I put them here upon request. I have not printed them myself. So any coment is appreciated how it turned out for you. Feedback so far is that just printed they are too light for actual use. I would agree on that, this model is for decoration purpose like architectural modelling mainly.

For smaller modelling scales casting these blocks in real concrete is not feasible, so here they are for actual printing use in smaller scale:

The original scale is 1:8 so here some examples to scale to your need:

1:8 100%

1:10 80%

1:12 67%

1:14 57%

1:14.5 55.2%

1:16 50%

1:24 33.3%

1:25 32%

1:32 25%

1:35 22.9%

1:48 16.7%

1:50 16%

1:64 12.5%

1:72 11.1%

1:87 9.2%