Pawel later commented on this post that this extruder is based on yruds/yegah design which is popular in Poland and it is a part of bigger open source project called BYQ 3d printer made fully in plywood .
Here is video of the extruder made fully from 8mm plywood in action:
BYQ plywood 3d printer has no 3d printed parts:
Here is the GitHub for the BYQ with all the files to cut plywood parts:
BYQ page in Polish where you can buy pre-cut kits: