Double MiniFala Extruder prusa i3

by ifala, published

Double MiniFala Extruder prusa i3 by ifala May 6, 2013
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...you must have:

  • abs parts normal and mirror
  • 1 xcarriagedouble
  • 2 small gears
  • 2 big gears
  • 2 M5 2cm
  • 2 Drive gear (3mm)
  • 4 bearings 605
  • 2 bearing 624
  • 2 M4 1.4 cm
    ..- 2 j-head or compatible..
    also compatible with budaschnozzle

info and photo instruction on:


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Great design but instructions or pictures on the drive gear assembly would really help

how does the big gear / drive gear stay in? looking at the 3d model it looks like it will work its way out

I just printed this, and working on assembly. There is one piece that isn't clear between thingiverse and your blog - what is actually driving the filament? I understand that on the big gear, there is the M5 bolt, and then a bearing, and then the '3mm drive gear', and then another bearing.

By 3mm drive gear, do you mean that it is a drive gear appropriate for 3mm filiment - like one of these: http://reprap.org/wiki/Drive-gear ? Was there a particular version you used?

I am going to be modifying the model to do 1.75mm fillament, and per your comment about the measurements, it would help to know which gear you used.

11 mm 12,5 mm 10,56 mm 5 mm /..... like mk7 gear... for 3mm

Thanks. I have a preliminary STL set that I am going to test. The Mk7 says it's good for both 3mm and 1.75 -- the only factor that might take me a few tries is if I have to move the guide holes, instead of just shrinking them. My first go just took the STL into blender, isolated the holes, and scaled down each end locking the correct axis to prevent ruining the top and bottom.

I actually expect it will work just fine, as long as there is an extra 0.75mm of flex in the tension arm that presses the idler bearing in to the drive gear. I have had luck doing the same thing in the past, (i.e http://www.thingiverse.com/thing:339581 on my profile).

I will comment back in a week or two if it works out. I have to source or make the drive gear, so it will be a bit.

Prusa i3 Rework Extruder Upgrade 1.75mm

Hi, great work. Can you provide the SCAD of you miniFala extruder?

hi, congratulations for that extruder! please, could you upload the .stl files of te DoubleMiniFalaUNION?? is the xcarriegedouble.stl same piece? how can i calibrate the 2 extruders for a 2 materials printed piece? (i have arduino mega 2560) thanks!!

ciao, ho letto sul sito che se si vogliono usare due nema17 più grandi (i miei sono da 47mm mi pare) si riduce l'area di stampa. Su una i3 non basta montare tutto l'asse y un po più avanti per risolvere il problema?

il problema oltre probabilmente a una riduzione dell'area stampabile, e' un problema di "pesi" ho adottato la soluzione che vedi con i motori piu corti per ridurre lo sbalzo dell'estrusore che altrimenti tenderebbe aumentare il momento "torcente" sull'asse x.
Non so quanta riduzione puoi avere inserendo i motori da 47mm, penso sull'asse y 1 o 2 cm massimo..

I was wondering how you got the 625 bearings in there? The holes for them come out to be ~14mm but the 625 bearings are ~16mm.

Yeah man!! I'm wrong the bearing correct is 605 and not 625 !

haha no prob, would you happen to have a 1.75mm version also? I don't think this one will bite the filament if I use it for 1.75.

Ahhhhr I don't know the measure of hobbed pulley of 1.75 version because I don't have!
And I don't have 1,75 filament for test it! Sorry! For now Ican't do the 1,75 version !

it's ok, i might be able to make something up using your scad files. do you have the scad file for the jhead version? :)

I would need to know what settings are changed so it can use BOTH during a print & how to calibrate. Nice looking piece of work!

woaaa notevole :O