Mini Internal Gear Pump

I have been playing around with some different pumps for a few projects.
this is the final tested version, seams to work good pumps well and seams to last a long time.

everything is printed other than the shaft witch i have added the stl and the pdf drawing.
it might work with a printed shaft but some work might be needed in fitment.

there are no bearings , everything is lubricated by the working fluid, and has no replaceable bushings.

port fittings are g1/8 or 1/8bsp, witch i then tapped for 1/8 tapered pipe.

can be powered with a few different motors, all of my pumps in this class have a bolt pattern on the back of the body that is 17mm diam, and a 4 bold circle ( on this pump one hole is suppressed but still has the same spacing)

I was working on a magnetic sealed drive , or a sealed shaft but I had to many issues to make it worth wild and went with a less expensive and complicated design ( moved the motor away from the pump)

parts needed :

all internal gear pump parts are need 1 of each
1 shaft required for the pump and some 4mm shafting ( stainless preferred ) to use the long drive ( cut to suit your aplication ) also needs 3/4 pvc or equivilant to be glued in on one end and clamped onto on the other .
6x m3 x 10mm fasteners
3x m3x4mm fasterners

the motor Im using has a 3.2mm shaft with no flat so I have it pressed into a plastic coupling witch seam to hold up in this application .
( ask if you want any specific couplings drawn up it wouldnt take much and ill add them here )

I will continue to work on this pump design as it was the most successful out of the other designed I attempted . I will post updates here for any improvements I come up with

If you are interested I have a video that compares the different types of pumps and talks about how I ended up with this as the winner .

( video link coming soon)

-