Mini Centrifugal Pump

by Madox, published

Mini Centrifugal Pump by Madox Nov 20, 2010

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3D Printed Miniature Centrifugal Pump Prototype

Prototype only - uploaded on request. Improved version coming soon.

Youtube Video of it in action : http://www.youtube.com/watch?v=H102VH8a8bM


Super Miniature version of it here : http://www.thingiverse.com/thing:4857


The 'base cover' does not sit the pump high enough to draw in water if placed on the bottom of a tank. Change the base cover or elevate it to ensure the impeller just doesn't cavitate around doing nothing...

Updated with an extra STL file (BaseCover.stl) that stands the pump a bit higher ;)

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Where do you get a motor for this and what are they called?

the thing wont print because I cannot ess the parts outside netfab.

Hey, I modified your design to print on a Makerbot and use a CD-Rom Motor.


Great thing. 8-)

CD-Rom Motor Pump
by Skimbal

Looks great, but is it water tight? I know the output from the Dimension BSt printers is not water tight. Although I still want to find a motor and try this, even if it does leak.

Yup, prints from the Up! can be watertight. Even if you use a porous material, CA always helps fix things :)

this is one of the neatest things i've seen on thingiverse yet! very well done!

Have you measured the head? How high?

Not yet...that'll require me to use the bathtub again :)

Too many bathtub Youtube videos already from me :

I also just realized the outlet is square... Unless there's a lower level reason for that... A circular tube will have less head loss and can couple to hoses easily... Just be sure to transition from square to round gently (a nice loft would be the ticket).

I thought you own an Up! too... the reason why its square should be obvious... you try cleaning the support structure out of something that small ;) A circular hole in the orientation I'm printing it in makes it REALLY [Impossible] to clean. The original one is circular...

I have a Dimension BST 3D printer, we use all sorts of dental picks and small drill bits to remove material.

Doh - that didn't occurred to me :p

Very nice design!

It is a pity that this kind of designs are hard to reproduce because of the dependence on the geometry of the DC motor. One good idea to solve this problem is to use, for example, motors from CD rom drives, which are really easy to obtain and are well standardized.

Those motors are, generally speaking, low torque... Generally speaking, because I haven't taken apart every optical drive ever designed and produced :p

That said, it shouldn't be hard to reproduce - you'll need to design part of the housing to fit the motor you're using ;) Modularity can sometimes serve to the detriment of design :/

Yes, you are right, they are meant low torque and high speed :-C

I'll give it a look anyway one of this days. Congratulations again!

Still in Shenzhen? Can you buy me 50 of these motors from Sagem? :)

Still in Shenzhen... But I'm leaving soon and in Pinghu town - 30-40 minutes from Seg (and that odd foreigner enclave, coco park) :( If I get the chance, I'll grab what I can - but my bags are overstuffed with hardware samples and production related stuff.

No worries, next production run is early next year gated by long lead time parts :/ It won't be long before I'm back to courteously yell at vendors.

starts twitching

Releasing early is always good. :)

I second that!!

Excellent work!! I have no hopes of being able to print at that resolution but can always dream...

oO Why can't you print it? I'm actually going to make it even smaller and finer resolution and print it using Shapeways...

If you are having shapeways make it doesn't that mean you can't print it at that resolution? :-D

The above one is printed at home using the PP3DP Up! printer :)

The planned 'micro' version is going to be roughly half size and needs to be 'Shapewayed' I would presume... might try print that at home first too :)

Have you consider having the motor NOT attached to the pump?

You can put the motor somewhere else, and transmit the movement through a flexible transmition (don't really know the correct name for it). The bulky parts (motor and gearbox) would be somewhere else, and the pump could be even smaller.

That would be really daft, though. The point of this is to make a small pump simply, and adding shafts and stuff would add massively to the complexity. Also, although the UP! is a great machine, you'd be hard pushed to get much smaller due to issues with things like printing the holes for said shafts.

Perhaps better to make the whole thing watertight with a small motor, then you just seal it and drop it in the water to do it's job, with just a wire for power.