by GiovaGio, published
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The goal of this project, started in Spring 2015, was to create a cheap and lightweight extruder, the first choose was "24BYJ48", substituted with "28BYJ-48" (Fig.1) because stronger, cheaper and easy to find.
This stepper motor is unipolar and it needs to be modified to become bipolar, there are 2 methods: the first method consists by unmounting the case (Fig.2). the second consists, in a faster and less invasive method, by cutting the plastic case and PCB, i suggest this method (Fig.3).
x2 - 28BYJ-48
x2 - 40mm fans
x4 - M3 screws + nuts
x4 - M4 30mm screws + nuts
x5 - M4 20mm screws + nuts
x2 - MK8 drive gear for 1,75 mm filament
x2 - 605 2RS 5X14X5 bearings
x? - M4 washers
The connection to RAMP 1.4 must be modified (Fig.4), the connector of second extruder is inverted connected
(Tolerance is always 0,5mm excluding Hot-Ends connectors)
Idlers are different and they are marked with L or R letters visible in the model, the washer is used to centering the bearing with drive gear (fig.6).
Hot-Ends connectors dimensions are copied from Greg Wade's extruder, their distance is 23mm.
How to use it:
This motor is slower, fragile and weak compared to NEMA17, plastic gears inside it can be easily damaged, so the Hot-End temperature must be increased to soften more the filament (in my tests i use PLA at 210-220°c), maybe the print speed will need to be slower, another problem with this motor is the pression of idler, if less the filament is not pulled into Hot-End, if too much the motor don't go, you have to find the right distance, i suggest to add washers at idler regulating screw to fix at the right distance you found, so u don't need to find the right distance everytime(Fig.7).
Top fan is needed because the motors overheat fast, motors drivers power should decreased because these motors need less power then NEMA17.
Steps per mm are ~1500
Max speed is ~8mm/s
The motor don't works: wrong wiring, filament idler pressure is too much, speed is too fast, driver power is too low, it's broken.
No filament extrusion: filament idler pressure is too much or less, Hot-End temperature too low.
Filament extrusion is unstable or stops after a while: filament idler pressure is too much.
Layers are not uniform/bad looking object: try to increase temperature(Fig.8).
Other objects in the photos:
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Giova's Extruder by GiovaGio is licensed under the Creative Commons - Public Domain Dedication license.
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