This page supports all legacy versions of the Toranado Precision Geared Extruder. - These versions are no longer officially supported, but all of the info to build one is still made available.
v2.1 - Toranado Precision Geared Extruder Latest Build
The Toranado Precision Geared 1.75mm Extruder - Current Build v2.02
Why the Toranado?
e_steps_per_mm Gear Calculation
- Significantly lighter than NEMA-17 geared Extruders
- Precision Geared
- Uses Ultibot's High Performance MK7 Drive Gear
- Modular Design - All parts are easily printable without structure and in your material of choice (PLA/ABS/PETG).
- Designed for use with E3Dv6 1.75mm Universal
- Attractive (like the one who designed it*).
*Note: There is still some minor discussion as to the validity of the designer being attractive.
Ultibot 1.75mm Drive Gear
Several Makers have tried to use Drive gears other than the one I spec'd from Ultibot. Unless you can find a drive gear that has the same effective diameter, I do not recommend using it - as the tangent point on the bearing will not apply force in the proper area on the drive gear. It is essential your bearing align well to the drive gear. I am currently looking for ways to include proper drive gears in future kits.
The NEMA-14 Stepper Motor
The motor I have spec'd is rated at 500mA, and even at the rated voltage NEMA14's run hot - be sure not to exceed the rated voltage. Also, You MUST follow the build Instruction guidelines for isolating the motor heat from the extruder mount - this is critical.
How to set the NEMA-14 properly For the popular RAMPS 1.4 setups:
DRV8825 1/32 stepper - you should take a DC voltage measurement exactly like this. To properly set the motor current, you should adjust your potentiometer to get the reference voltage as close to 0.25V as possible. 0.25V = 500mA (0.5A) to the motor. (Any VREF measurement between 0.24-0.26 should work fine). Formula: Measured VREF x 2 = Motor Current
Pololou A4988 Driver - measure to voltage exactly like this. If you are using drivers from Pololou - to properly set the motor current, you should adjust your potentiometer to get the reference voltage as close to 0.2V as possible. 0.2V = 500mA to the motor. (Any setting between 0.19-0.21 should work fine). Formula: Measured VREF x 2.5 = Motor Current.
NOTE: If you are using certain Chinese clones of the A4988 Driver, the formula is different. See This Post about adjusting your voltage setting on the stepper driver, depending on the type of A4988 that you have.
NEMA-14 WIRING to RAMPS1.4 w Ardino Mega 2560