I found this: https://www.instructables.com/XL-LEGO-Christmas-Tree/ so i wanted to make it a 3d printable model, al the credits go tho the original creator.
Build is the same as in the link, you will need the tube with 25mm outer diameter, but can use 3d printed spacers instead of the other tube (the one with 25mm inner diameter.), i recommend to print one small part first to check tolerances and scale the model a little bit a s tuubes are sometimes different.
It will fit on a Bambulab a1 mini
If you want a a smaller tree:
60% scale the Modells for the inner tube to have 15cm outer diameter.
For 10 cm use 40%
All parts a re needed once.
The author remixed this model.
I made 3d printed spacers because i coundnt find the needded tube, also i made everything 3d printable