This part of the Marble Exercising Machine is the open Archimedean screw. It also includes assembly of the half rpm shaft of the gear train.
The components needed are:
One of each of the stl files above.
And 'common components' from part 1:
Spur gear 8 hex - 1 off
Spur gear 16 hex - 1 off
Bevel gear 12 type 1 - 4 off
Bevel gear thrust adaptor - 1 off
M6x15 cap screw - 2 off
M8x7 large head thumbscrew - 2 off
Also required are three 3mm dia steel rods, of 197mm, 99mm and 38mm length.