Tyranid terrain capillary hight tower. I start from the excelent work of AxoloteGaming and onebitpixel. Take a look and support them, they are great! I'll be glad if I can work on something with them someday.
The first set: https://www.thingiverse.com/thing:3773189
Second set: https://www.thingiverse.com/thing:3968628
Third set: https://www.thingiverse.com/thing:3971251
I made them to be printed as cheap as possible 0.8/1.2 shell 3 or 5% infill. On this print support is needed. You may use personalized support instead of integrated version wich seems to not works very well.