I made a mistake… user error… I bought the decorative blocks skill before buying the can craft mixer and titanium skill. Half of the decorative block recipes require the use of a mixer. I wish I had known that (I mean I could have left the game to read the wiki) I would have bought the mixer skill first and focused my efforts on building those recipes. There have been a few crafting skills like this that are not clear in the skill tree that you should be purchasing other skills first. I have been lucky most of the time to buy the correct one first. Is there some way to make this more apparent in the skill tree?
They could make it locked until you buy the other skill.
Or it might be planned so you could buy it set it up and use it, not needing the points in the skill to make it, hard to say.