Sunday, 5 March 2017

Stage 3 - 101spiderman Prequel

Before moving further to the extruder upgrade, I would like to give you more details on the electric and electronic parts using in 101hero.

1 x 12V 3A power supply, 1 x controller, 3 x stepper motors for the pylon (cable A B C) , 1 x stepper motor for the extruder (D), 1 x thermistor (E), 1 x cooling fan for the extruder (F), 1 x heater assemble (G), 3 x limit sensor switch (H I J)

The controller is Sanguinololu clone with ATmega1284P and 4 x Pololu A4988 stepper motor driver. The preset current limit for each motor is around 480-500mA

The 3 stepper motors for movement is a custom made 12V 28BYJ-48 with 1/32 reduction ratio. I believe the supplier does not use the normal 1/64 one is it cannot provide enough torgue even printing at 14mm/s. I will go deeper on this topic when talking about replacing the extruder stepper motor to NEMA 17.

The stepper motor for the extruder is the normal 12V 28BYJ-48 with 1/64 reduction ratio but longer shaft.

The thermistor is 100K ohm NTC 3950

The cooling fan is 12V 25mm 90mA fan

The heater is 15W and will draw 1250mA current.

The total power consumption of the 4 motor plus the heater is already need 3A that the existing power supply is merely able to support. So if you want to go further, you need to upgrade the power supply. 7A is the minimum requirement if you want to be the superhero.

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