I've found a source for some low cost Nema-17 motors but they might be a little on the feeble side for an i3.
The spec's are:
5.6v, 0.85A, 6.3 ohm, 7mh, 4 wire bipolar. These are a custom variant of a type made by SEI. Other 4 wire motors in this series of motors, have a rated torque of 50oz/in, the 6 wire motors in the series are rated at 38oz/in. The sizes of all of these motors are standard Nema-17 width and height (42mm), the depth of these are 1.5".
This motor actually appears to be the same as a similar bipolar motor rated at 2.8v and 1.68A, with 50oz/in torque. ie: it is double the voltage and half the current of the model it was derived from.
(http://www.sei-automation.com/StepHybrid.html model 17H150-168-4A is the original motor this model was based on.)
Assuming the motors in question are somewhere between 38-50oz/in torque would they be suitable for the standard sized i3 design? I will be using 1.75mm filament, so the extruder doesn't need as high a torque motor as it would for 3mm.
The spec's are:
5.6v, 0.85A, 6.3 ohm, 7mh, 4 wire bipolar. These are a custom variant of a type made by SEI. Other 4 wire motors in this series of motors, have a rated torque of 50oz/in, the 6 wire motors in the series are rated at 38oz/in. The sizes of all of these motors are standard Nema-17 width and height (42mm), the depth of these are 1.5".
This motor actually appears to be the same as a similar bipolar motor rated at 2.8v and 1.68A, with 50oz/in torque. ie: it is double the voltage and half the current of the model it was derived from.
(http://www.sei-automation.com/StepHybrid.html model 17H150-168-4A is the original motor this model was based on.)
Assuming the motors in question are somewhere between 38-50oz/in torque would they be suitable for the standard sized i3 design? I will be using 1.75mm filament, so the extruder doesn't need as high a torque motor as it would for 3mm.