Print all parts as they are orineted in the project file. Use a lower layer height for the screws and the blade for finer treads, 0.15 worked just fine for me. Use supports on the inner half of the handle and use 100% solid infill for the blade to give it a little bit more weight.
The author remixed this model.
Holes and screws weren't coming out good on standard .2 settings in Bambu slicer. So I swapped out the screws for fasteners, shrunk the sizes down ever so slightly, and now it slides perfectly. just use a little glue to secure.