The file 'Extruder Drive Gear Test Rig 3D Printer Model' is (rsdoc,stl) file type, size is 1.7MB.
I designed this testing fixture to compare the "bite" between several different extruder gears. An axle made out of a metal clevis pin holds the drive gear, pivots at one end, and allows you to hang a weight on a string from the other. Then I used a pull scale (for weighing luggage, fish, etc) and tested how much each gear could hold before slipping.
Full test details and results are in my Instructable. http://www.instructables.com/id/Extruder-Drive-Gear-Shootout/
Source file (DesignSpark Mechanical RSDOC) is included here.
gear_test_rig.rsdoc | 653.0KB | |
gear_test_rig.stl | 5.0MB |