Of all of the blocks that looked like they were molded at Puma Punku, there were 3 different colors, one was a gray bluish color, the other was gray just like cement, and the red sand stone as seen below. None of the red sand stone blocks had sharp corners on them. The picture below looks like someone had tried to carve these patterns in solid stone which would be almost be impossible to do while leaving perfect inner and outer corners. Chipping stone like this would cause some radii on the corners to form due to the chipping. The blocks that looked like they were molded had none, other than some odd chips that happened afterwords, these were sharp and crisp, something that you would expect from a molded part.
Below you can see that the corners are rounded and the flat parts on the block are wavy and uneven.
It seems that the molding theory in not widely accepted for these blocks, it’s as if some people think this takes away from the interest of Puma Punku or the skills of the natives. I am sure they figured out that they need a faster way to make their temple than chipping one block at a time: can you imagine how long it would take to make one building at that rate? I think they knew how to mold these blocks, figured out how to make molds and a cement type mixture, and do a production run of these blocks. This is in addition to the skills they already had at carving stone so to me this just adds to their brilliance.
On all of the carved stone that was done on massive rocks including Ollantaytambo, Sacsayhuaman, and Machu Picchu that were obviously not molded, all of these have small radii in the inner corners (at least on all of the rocks I saw) while these blocks at Puma Punku did not have such radii. If you look at the Benches at Ollantaytambo you can clearly see these radii on the inner corners- when sanding in any corners these are the most difficult to get right and especially sharp.
There are a lot of carved stones with signs that they were carved at all of the other sites at Tiawanaku, but there are a handful that just do not show these patterns, mainly at Puma Punku
I would love to hear from anyone that does Petroglyph Analysis, if you have done any work with the stones from Puma Pumku, even better. I had a conversation with two people that do these analysis and and both of them said that even if the stones were man made they could not prove it for sure.
The people that built Puma Punku could have known something we don't know today about making a cement type slurry.
The question is, are these naturally formed blocks or are they man made?
If they are man made I think my theory can explain the rest of the process to make these blocks.
With this method you would not need steel molds or diamond tip tools. You only need tools and materials that they had available to them at the time.