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$ \frac{2.85\ mm^2}{1.75\ mm^2}=2.65$ which is the reduction you would want assuming a 1.75 is direct drive.

In this answer I am comparing the amount of filament flowing though the extruder by using $ \pi \times r^2$. Dividing the 2 values gives the ratio of the 2 speeds. A gear ratio is them used to change the speed.

$ \frac{(2.85\ mm)^2}{(1.75\ mm)^2}=2.65$ which is the reduction you would want assuming a 1.75 is direct drive.

In this answer I am comparing the amount of filament flowing though the extruder by using $ \pi \times r^2$. Dividing the 2 values gives the ratio of the 2 speeds. A gear ratio is them used to change the speed.

(2.85mm)^2/(1.75mm)^2=2.65 which is the reduction you would want assuming a 1.75 is direct drive.

In this answer I am comparing the amount of filament flowing though the extruder by using pi r^2. Dividing the 2 values gives the ratio of the 2 speeds. A gear ratio is them used to change the speed.

$ \frac{2.85\ mm^2}{1.75\ mm^2}=2.65$ which is the reduction you would want assuming a 1.75 is direct drive.

In this answer I am comparing the amount of filament flowing though the extruder by using $ \pi \times r^2$. Dividing the 2 values gives the ratio of the 2 speeds. A gear ratio is them used to change the speed.

(2.85mm)^2/(1.75mm)^2=2.65 which is the reduction you would want assuming a 1.75 is direct drive.

(2.85mm)^2/(1.75mm)^2=2.65 which is the reduction you would want assuming a 1.75 is direct drive.

In this answer I am comparing the amount of filament flowing though the extruder by using pi r^2. Dividing the 2 values gives the ratio of the 2 speeds. A gear ratio is them used to change the speed.