Character Tower（Conclave Characters）

I love the original version by JustinSDK.

But I have problem in printing embossed characters, even with inner wall.

My FDM cannot deal with collapse in printing, especially Number"7", or alphabet " T" etc.

And one more thing, I'd prefer to have a perfect cylinder as tower rather than a gap caused by spiral on top.

So, inspired by original code, I rewrite it a little,

Main changes are :
1. Characters are now enclave, easier to print without collapses,

2.It's now a cylinder without gaps on top.

3.Render time saving. It costs less than 1 hours to render in my MAC Mini instead of hours.

4.Thinner bottom to save PLA as well as time.

BTW:
I fail to upload 15M STL for 10 times at least. So please download the 15k openscad and render it to stl. It will take less than a hour.