The structure added with a slight thicker bottom gives a lot more weight stability.
All other parts have to be printed from the original model:
OT: Have mercy, it's my first model :-)
The author remixed this model.
Problem: The roller bends a lot when using 1kg spools, so the spool always slips to the outside.
Solution: Giving it a bit of a support to prevent the arching of the roller.