I have never seen them. As mentioned in the other forum topic they are available in books as an illustrated chart with directions.
So I will tell you why I don't think it would make alot of sense to print these, though they used to do it.
Ballroom steps, are often deceptively simple if you look at the foot pattern, but when you start looking at weight transfers and that sort of thing it gets complicated beyond the ability to walk on predetermined footprints. I know a lot of steps that have foot placements that are fewer than the actual times you count the movement (weight change). I could see it confusing the tar out of people as they tried to learn some of the more control intensive steps.
Many latin dances don't travel very much so your footprints aren't going to be clear but rather stacked one on top of the other until what you have is a blob of mess that is difficult to follow...(how can step three be in the same place as step one?)
Steps flow into each other and sometimes you need one step to set up the next step and footprints can't accomodate that very well without teaching you to dance as if you were in a rut and confuse your understanding of how a dance should or could be put together.
My legs and your legs aren't the same and so it's going to teach people to dance the wrong length of footstep and that can ruin flow and artistry. I could just see this making people so mechanical, worse than the people who can't put down their foot until they've said the number so that dancing becomes a disconnected series of dot-to-dot.
I would think on top of that it's going to train you to use your feet wrong. Many movements in ballroom are flowing and require feet to brush and weight transfers and movements to happen between foot placements and I don't think footprints could accomodate that.
Also, let's say you get it all worked out and someone does figure out how to make it work...who has a big enough room in their house to even think of accomadating a Viennese Waltz layout etc.?
Someone does have these on the computer on a grid. I saw it years ago so if you are determined it is out there if you don't have to have it printed. I would just suggest it is probably going to hurt way more than it helps.