Parts and consumables:
2@$0.54 M8x75 Coach screws (extruder feeder)
4@$0.17 M6x20 Bolts with nuts (bushing attachment)
1@$1.70 P240 sandpaper
1@$1.80 P600 sandpaper
1@$1.70 P2000 sandpaper
1@$3.99 300mm Non-stick pizza tray
1@$6.50 M10x1m galvanised threaded steel rod
8@$0.16 M10 galvanised steel nuts
2@$9.06 15mm x 1.02mm x 1m copper tubing
?@? Brazing rod
?@? 556 CRC or other light lubricant for lathing and polishing
?@? thermoplastic (polymorph, PLA, PHB, etc)

Tools:
Electric drill with mounting (or drill press)
Propane torch (or oxyacetylene set, etc) for brazing
Assorted clamps for holding things in place