I noticed that quite a few people are disappointed that I did not improve the 3D printed pump with a metal shaft. So here is a quick explanation why I stopped at that point. The reason is quite simple and is called time. I already spent 60 hours on this project when I got to the point when the shaft broke. That of course includes everything like planning, getting parts, writing a script, doing test, filming,......... Of course I could have tried improving the pump with a metal shaft but due to other problems I noticed that come with such a 3D printed design, I decided that such an option would not be sufficient for my garden and declared buy as the winner. If I would not have done that, then there might have been a successful water flow with the 3D printed pump but then again I would probably not have enough time to produce the next video for my channel. I appreciate all your feedback and I also love to tinker and get things to work. But I still have to think about getting content out regularly because this is my full time job. You can always support me through Patreon if you do not like this concept. So I can pretty much independently decide how much time I want to spend on projects instead of thinking about how to please the KZfaq algorithm. Thanks for understanding.

You should have drilled the plastic rotor axle, to replace it with a metal one. I guess this could have made your pump work a little better.

I'm watching your channel after a long time. Used to watch it regularly. Great to see you grow so big.

There's a lot of issues with your diy solution. 1)the axle was thin enough that there was no contact with the bearing. The oscillation of not being held perfectly centered could have contributed to the shaft breaking 2)the long axis of the shaft was printed upright, meaning it could easily shear along the layer lines. Print it sideways so the layers run along the long axis of the shaft 3)petg is one of the most brittle 3d filaments out there. Abs would probably have been a better solution in the first place 4)3d printing the shaft was probably not the best idea in the first place 5)you could add a u groove in one of the sides of the pump enclosure, and lay a thick bead of silicon in it to create an o ring Those are the issues I'm seeing right off the bat. I'm sure there are more issues that led to failure, and I also saw a lot of areas that could be improved, but didn't necessarily lead to failure.

I noticed this in the first instance. I have made my own pumps but without 3d printing. I made small pumps by casting exposy resin and grinding it down. Now all you need to do is screw in proper shaft and add a waterproof bearing. These you could get from old blenders. Yes, the size will be large but you can adjust your shaft to be thick in the middle.

4:59 Your fins are mirrored, that causes a lot of extra stress and resistance to flow.

You got so close and just said “eh whatever “ 😂 all you needed was a metal shaft and your gasket would’ve worked and you need to prime the pump but it’d have done the job

I bet that Trinamic are great 'The Expanse' fans :) Lovely print on that chip!!

9:16 anyone with a 3d printer saw that one coming since 4:20 such a small cross section of 3d printed material is really weak especially when printed along layer lines

Should have tried a metal shaft. The rest could be 3d printed

this guy is one serious engineer. he knows his stuff

Did you see the "rocinante" and the drawing of the ship from the expense on the ship ? Nice touch ahah

Why didn't you make a 5mm hole in the rotor and put a M5 bolt to be used as a strong shaft? I think your huge pump could work well! 💪

You could use a long m4 screw with two washers to act as a shaft . It would be more durable

8:52 „… does not work well with my small balls.” :-D

Dear Greatscott, Thank you very much for giving us Directions for our DIY projects through your experiments ...

The vanes on the orange pump curve the wrong way, that would put more strain on the shaft, although the shaft sould be bigger or replaced with metal

9:26 they probably used the motor shaft instead of a 3d printed one, judging by how close the motor is to the impeller

Hadn’t heard of Trinamic. Now I have, checked out their site. Just what I needed! Good sponsor to have.

I love this series

7:38 *The Expanse* fans? 🚀

Use a metal shaft for the impeller and it will work perfectly. I have made several 3d printed pumps with no issues. Simply attach the impeller directly to the metal shaft of the motor. I understand that it wasn't worth your time though. Also your pump impeller had blades that are curved in the wrong direction. they need to be curved backwards to the direction of rotation.

This video just need a second episode. It is so fun.

Great job mr scott you proved that everything is possible by ourselves. I really appreciate your work and dedication.

the sweep angle of the 3d printed vanes is backwards.

"I noticed the big tubes did not work well with my small balls (bowls)" Funny :)

Very instructive.

Nice project. I like it

Any other "The Expanse" fans caught the reference? :D

That was such a wrong use of teflon tape in the beginning I love it

Great Scott, you are great. Thank you for all your awesome videos. You can always replace the plastic impeller shaft with a metal one.

I love the look on your face as you scowl at the garden out the window.

0:08, yeah, the "winter" in Germany now is incredible!

Nice experiment there. I enjoy your sunday videos every time. A steel shaft for the impeller(fine tuned inner diameter for the shaft) with two 608s in line would improve things. Mach weiter so!!!

Great Scott!

I liked it, thx for the comment on the time to put things together.

Instead of printing the shaft as a cylinder, you can rotate the model in the slicer 90deg and print it so that the layers are parallel to the axis of the shaft. This will add a TONNE of strength compared to your current design. You will have a lot of supports to remove in the end it won't looks as pretty bu it will be hidden anyway😉

Please do the irigation automatization. It would help a lot.

Really nice video!

lol I like the Expanse reference on the speed controller.

Dude you need an aquarium ;))) And at 5:09 the pump vanes are backwards bud 6:08 STILL BACKWARDS...!!!!! ;))) If you have the canes in the correct orientation then it might not fight itself and won’t have such stress forces.

Idk why, but i really like water pumps

haha I like the sound of defeat in " Buy is this time, like most of the time, the winner".

Awesome, the same I was trying to get a automatic water supply solution for my garden, which works on three input (humidity/moisture, time and temperature)

Every video he says "Stay Creative" his voice gets up a tone xD

You need make a second part for upgrade and fix the pump.

great job man!

Amazing videos thanks!!

the diameter of the impeller axle shaft, made me react instantly :-) Otherwise it was a nice video

00:14 I totally *NEED* that 😋

Very good video. You have not only printed a pump set but also discussed about its advantages and disadvantages. Some other KZfaqrs are there who just takes credit of making a pump without any actual result.

Always appreciate your videos, buy vs build. Keep up the good work. Thanks

The Expanse :D 7:35

second attempt with metal shaft?

Thanks for this interesting video.

All your videos are good.

2:43 why do I find this funny

Your impeller is wrong. As it is, it tries to draw inverts.

Good job

Definitely Always Look at the Dimensions!

Never seen anyone use Teflon tape on barb fittings before....

3:43 That's what she said...

oh my that pcb with the Rocinante spaceship from The Expanse looks awesome

Ahh, look at that Noctua fan on 3D printer! Beautiful! :)

Why didn't you try that with other materials? (in the 3D Printer)

Next episodes of Greatscott: LEDs - DIY or buy? p-n junctions - DIY or buy? n-type silicon - DIY or buy? silicon crystal - DIY or buy? sand - DIY or buy? 🤣🤣

Rocinante! Nice! :)

Great video. I have done quite some 3D printing myself, and I saw the weak point from a mile away ... 😀👍

Nobody: Great Scott: *H O T G L U E*

8:52. That's what she said :)

Love your videos bud. Been a subscriber for a while now and never miss a video. Keep up the good work.

I have that Chinese exact pump. It's been sitting at the bottom of a water butt for two years. Still working. It switches on when the soil gets dry. I designed a capacitatave sensor thing to activate the pump. It moslty works. I added a float sensor so that it never runs when the water butt was empty. Happy plants.

The design you chose is pretty terrible. Also not really comparable at all to the commercial one.

I am watching you now for some years and normally enjoy your videos, but this was unfortunately your worst one.

OK, the Roci on a chip sold it for me!!!

I designed a similar project a few years ago. I used a submersible aquarium pump which is self-priming with magnetic drive. You need to ensure that not only the flow is good but the "head" or how high the pump can pump the water is also adequate. I had some hanging plants. Interested in seeing the control and measurement part of the design.

Wtf?!? I looooove the motor controller board with the IC named Rocinante!! It's the ship from the expanse, but u guys knew that already. It's a must watch show!

So close to perfection.

I've made small water pump with junk plastics, metal and dc motor. I've made the fan by cutting and and glueing plastics and metal. The performance is satisfactory for a small pump. The most important thing is I had fun doing it :)

Amazing pump. Engineering is just like this...try, try, try and try it again until you get the desired results. Congratulations.

I use flexible filament for seals on outdoor long term timelapse cameras, and they work pretty well

My first time seeing this youtuber & I appreciate his efforts & I have subscribed. I do have a comment for all those who are coming across as critical. His purpose was determining whether it was worth diy or not. So he succeeded in his purpose. Realize that commercially manufactured pumps are (generally) designed by college educated engineers who are experienced in pump design. While I found many of the comments to be beneficial to my own education, it simply wasn't worth the time for him to research and learn all of that in order to accomplish his goal.

Awesome

Amos approves your mechanical skill, Naomi wrote that code.

That automated greenhouse project that you mention at the beginning of the video sounds really interesting. Please keep us updated on that.

I have long ago predicted that the laminated 3D printing is rather (we have one in the lab.) weak; thank you for proving my foreseeing!

Finally i can make my own water pump to my watercooled build

I had this same problem. Get an RV style pump and a ballast. Works perfectly with hoses. Much less work than 3D printing. Shuts itself off, runs on 12V. Cheap. Extremely effective.

Large pump is worth a revisit BUT using: 1. A stainless steel shaft instead of the plastic one 2. Stainless lock nut on the outside end of the shaft, captive bolt head at the inside 3. Use normal bathroom silicone sealant bead to seal the outside cap 4. Probably MOST important ... Use a sealed bearing AND shaft water seal on the inside between the bearing, the shaft and the housing Great video as usual.

please @greatScott during the creation of your green house, share how you do it, that way we can see the cool stuff such as humidity measures and auto watering

cool one

Nice video

Yet again we get projects exactly at the right moment. Logged into KZfaq after closing a dispute with AliExpress over failed delivery of a 12v water pump and voila! We now know how to make one ourselves. Some day in near future I think we need a material science class with regards to 3d printer materials.

I feel like this boils down to your R&D restrictions: there are numerous solutions that all might help fix the issues with DIY that you found. Perhaps try to use those solutions when you actually get to implementing it in your greenhouse system. Printing in another direction or not with the layered extrusion method might help, or using metal parts for things like the shaft will very likely solve it. Great video even if it was less conclusive than you like to be, time constraints are tough to work with! :)

Go for a gear or screw pump, they are self priming. This might be a better option for your garden, as you will not need to fill your pump with water each time you need to water your plants. Gear and screw pumps can also be used to prime a centrifugal pump

You can always make parts like the shaft thicker to increase strength. Additionally, there are many other materials you can print with, such as carbon fiber, to get much stronger parts. I would consider magnetically coupling the impeller instead of a direct drive. Also, I would experiment with different blade design to make for more efficient fluid transfer.

glad you spent the time to figure this out and not me!

For low pressure I use Rule boat bilge pumps, cheap and rock solid. For high pressure I use RV water pumps that will do 55 psi, for things like spray emitters irrigating my lawn.

Fantastic video and I'm glad you tried so hard. Love your videos and keep up the good work. X

Lol... Printing the smaller pump with metal axle is a winner... Not a commercial one