Designed with onshape:
https://cad.onshape.com/documents/091406a7ef1198706853668d/w/6aaded63e76f8f32f595a3da/e/91ed2006ab619206b832943b
source of used models:
christmas tree: https://www.thingiverse.com/thing:1913982
robot: https://www.youmagine.com/designs/official-ultimaker-robot