×Read this message from Erik, founder of YouMagine

3D printed Jet boat V2

Version 2 of the 3D printed jetboat project.


Creative Commons Attribution Noncommercial Share Alike

Commercial use is not allowed, you must attribute the creator, you may remix this work and the remixed work should be made available under this license.

Learn more or download attribution tags


Latest version here: http://www.simply3d.co.nz/kwikjet

semi final update:
Version 3 is now out still untested - there for those who are keen: The only changes are a new hull shape. All version 2 and 3 parts are compatible. I'm working on a new version yet again. Next version will be 600mm long with 35mm pump.

running on 12volts (3S)

Running on 24v (6S)

Too fast! I look forward to trying it out on a smooth lake one day.

Forum thread: https://www.rcgroups.com/forums/showthread.php?3061106
Version 1: https://www.youmagine.com/designs/prototype-jetsprint-jet-boat
Version 2: (you are here)
Version 3: https://www.youmagine.com/designs/version-3-3d-printed-jetsprint-jet-boat


  • Impeller: 29mm diameter, 29mm pitch
  • Exit nozzle diameter: 22mm
  • Hull length: 460mm
  • Hull width: ~185mm
  • 9g servo for steering (can use larger servos when adapter plate used)
  • Weight of printed parts: 550g (PLA), 460g (ABS)

Power system:
As you can see in the video, the power system I used was completely over powered. The boat does appear to handle better when it is lighter and a smaller motor would help reduce the weight. Parts used are as follows:

  • 3674 brushless inrunner motor @1900KV. 61A max. Max power 1800w.
  • 2x 2200mAh batteries, 25C.
  • 120A watercooled ESC

Improvements in this version:

  • Deeper v - skips over the waves less
  • 30mm longer and 20mm wider
  • Better sealing lid with only 2 screws for easy/quick opening.

Ideas to improve for the (maybe) next version:

  • Add printed ducts inside of the hull. Then have it use the venturi effect to suck any water out of the bottom of the boat this way the boat would pump out any water that got in when the pump is running
    • Thats about it. I'm pretty happy with it as it is. Suggestions for improvements are welcome :-)

UPDATE: I've now added a bash plate to the nozzle. The new file is called "nozzle & bashplate.stl" and can be found in the download.

Materials and methods

Can be printed in ABS PLA or PETG. ABS is my preference. If you are using PLA try to keep the fan off for the hull parts or else the sharp hull corners tend to lift a little.

Use 0.15mm layer height for the impeller. Print with supports enabled. For all other parts I used 0.25mm layer height with a 0.4mm nozzle on my Original Prusa i3 MK2.

The nozzle takes a 3mm inner, 4mmor 5mm outer diameter teflon tube as a bushing for the shaft (check the last two pictures above). I cut 5mm off some spare bowden tube and used this. Teflon is a very durable and low friction material - perfect for use here.

Bill of Materials:
- - Weight of printed parts: 550g (PLA), 460g (ABS) you'll need a bit more than that because of required support material
- M3 misc screws
- 6x self tapping screws 10mm long or so
- 1x 105mm long, 3mm stainless steel rod as driveshaft. To mount the impeller securely I ground a flat on the shaft, sanded the rest of the area that was doing to contact the impeller and super glued it in place.
- 1x 623RS bearing (623ZZ is also fine but rubber seal is of course better when water is involved)
- 1x 750mm of servo pushrod wire (most of it is used as a water intake screen)
- 1x flexible coupler to go from motor to the driveshaft. I used 3 to 5mm universal joint adapter. Most 36mm diameter motors use 5mm shafts. I would recommend a universal joint which can be found for $1-2 on aliexpress. You could print your own universal joint or direct coupler (both are printable and included in files).

- 1x 9g servos

- 1x Motor + ESC
I'll be using this motor: https://hobbyking.com/en_us/turnigy-xk3674-1900kv-brushless-inrunner.html
And this ESC: https://hobbyking.com/en_us/hobbyking-120a-boat-esc-4a-ubec.html

My reference told me to pick a motor/battery combo that delivers up to 20,000 rpm and can handle about ~75A continuous. Refer to: https://www.kehrer-modellbau.de/en/kmb-jet28/jet-drives/kmb-jet28-rev.-3-with-short-steering-nozzle

Included in the files are mounting brackets for 36mm and 28mm diameter inrunner motors as well as a mount for common airplane motors using 19mm hole spacing.

- 2x lipo batteries. You'll want two: one to place in either side of the motor for balance. I will use 2x 2200mAh 3S lipo batteries. I like to use velcro to hold batteries in place. I feel its a bit on the heavy side so lighter batteries wouldn't hurt
- 1x transmitter/receiver set. I will be using my Flysky i6 setup.

If you have any questions, please do ask!



Issues are used to track todos, bugs or requests. To get started, you could create an issue.


Eba94f1e2c12f049fe5a62847adb80a9?default=blank&size=40Johnson69 added this to the Rc shit collection ago
237f603a5747d5d6e3d3e7c723f1392c?default=blank&size=40damiano added this to the rc collection ago
9d99e4fbcfd1a73273fa571307b35e60?default=blank&size=40Adreden Gaming added this to the RC Boats collection ago
1ead9dde8d5289f4dec4ec48d9dfacc4?default=blank&size=40bman commented ago

Hi Jotham, First I would Like to Thank You for This Design.. Iam having problems trying to Print the 3 hill Sections , I normally use Cura Engine to Slice, have tried slicr3, With no luck.. I seem to be chasing boggers / hashmarks all around the Hull Sections.. I have already wasted a complete roll of PLA on this.. Any Help is greatly appreciated.. Am using a Tron xy , with a .4mm nozzle and tried printing at .2 and .1 layer heights,.Please Help, Thank You , bman.

62669cdea8c577899916b5f16757cb44?default=blank&size=40Chris Osborne added this to the RC collection ago
0fafe0ec052a56fcd4f266b4fb501d46?default=blank&size=40Jacob Fonseca commented ago

Could you please send a link to where you brought the driveshaft from?

4e4100e69a02c4a13453f1db73aa6a02?default=blank&size=40Budking328 added this to the Boats collection ago
157cfeb7f38e198bc79542551f0cc95b?default=blank&size=40Muppet400 added this to the Collection collection ago
157cfeb7f38e198bc79542551f0cc95b?default=blank&size=40Muppet400 commented ago

A way to stop it porposing if you could adjust the jet nozzle down a bit to force the nose down. a bit of trial and error to get it right have it to much and it'll nose steer

5ea886f25e89ea1ebbae5714e40d075f?default=blank&size=40Alexander Nystedt commented ago

is it a problem if the pla warps ?

5ea886f25e89ea1ebbae5714e40d075f?default=blank&size=40Alexander Nystedt commented ago

what cooler thingy did u have on the motor

could u send a link for it maybe ?

299e8f191e496c1cfccfbe3345787181?default=blank&size=40eagleanurag added this to the humanoid collection ago
299e8f191e496c1cfccfbe3345787181?default=blank&size=40eagleanurag added this to the drone and fpv collection ago
59b3be8748126b885c7200040595529a?default=blank&size=40Jose Manuel Torralba added this to the RC collection ago
62f68cc5489c55a3f749c06dfd2bc440?default=blank&size=40j-appel added this to the Mine collection ago
07875ace0bc0a14a7576913229176344?default=blank&size=40HΓ©ctor Reyes added this to the things to print collection ago
7e07a12dbea44a0e269acc3dd02eef87?default=blank&size=40Rockest55 commented ago

Nice design. Already printed also. Do you have normal solid file format like step or iges of the whole boat while i would add some internal parts into the hull for some fixings? Also the collar of the hatch frame could be at least 2 mm higher. And the steering part upper axis point is way too weak, it breaks easily.

21ad2f81a2559826d439da4c67ca00ef?default=blank&size=40Gabriel Machado printed this ago
Carousel thumb 20190922 144110
Printed on:
Creality Ender-3
Great design! Nice project, ill post when i finish painting.
21ad2f81a2559826d439da4c67ca00ef?default=blank&size=40Gabriel Machado printed this ago
Carousel thumb 20190922 144110
Printed on:
Creality Ender-3
Great design! Nice project, ill post when i finish painting.
21ad2f81a2559826d439da4c67ca00ef?default=blank&size=40Gabriel Machado commented ago

Hi, i just finish printing the hull, it have bend a little, i glued that way, but i wanna know if u have made some base finish and paint? i'm thinking of using some fiber glass to make the finish in the outside of the hull, what do u think?

330e735e74ec9f0dd00d9e78d7a27582?default=blank&size=40maxxxmax added this to the RC boats collection ago
Bb75da4d7e6f900f5f6d759169083cb1?default=blank&size=40Jotham B commented ago

Sure, I can send you the one in the photos, I don't use it anymore since I

have a newer version I printed. Email me your details: jotham@simply3d.co.nz

and at cost of postage I'll send it to ya. :-)

C9801ef04150ec8a397fc88a5408d558?default=blank&size=40squeakiwi commented ago

hi I'm from new zealand too, will you be able to print it for me? I don't have access to a printer thanks.

C9801ef04150ec8a397fc88a5408d558?default=blank&size=40squeakiwi added this to the jet boats collection ago
Bb75da4d7e6f900f5f6d759169083cb1?default=blank&size=40Jotham B commented ago

I can't sorry. I'm in NZ it's a little bit far away!!

You can buy a ender 3 3D printer for like about 200euro so that might be a

good option for you.

0d2418d4f3ef5aed50975e883d9d0967?default=blank&size=40RV lea commented ago

hello , i'm a french boater and would like to know is it will be possible that you print it for me ? thank you

98c7d3cd902a215f25dcf76bf643dce0?default=blank&size=40Gyore Balazs added this to the Boats collection ago
9791e5d9ec76c383edd8928922ce4a9d?default=blank&size=40Bicesterbloke printed this ago
Carousel thumb 2019 03 03 15.59.58
Printed on:
prusa i3 steel
This is a great design thank you so much. Loved putting it together. Works great in bath and cant wait to try out on lake. It's going be fast!
9551a9b6a0a91d255274fd5bbd2991d6?default=blank&size=40Istvan Jano added this to the rc boats collection ago
40b39ce3caee79d5ae2c1b063962c620?default=blank&size=40CatalinOlteanu added this to the barcute collection ago
6e7e945a2b046f004efcc47c12cebf4e?default=blank&size=40n1ckv36y5 added this to the RC collection ago
08a198a96c54b92dfcdf8ee6f180ec81?default=blank&size=40T J added this to the boat collection ago
D2ed8f3f81a2daadd6b2028f043d6263?default=blank&size=40Matthew Howard added this to the Jet Boats collection ago
57b9226fe34a7877fb8f481e97b9fe99?default=blank&size=40David Bowers added this to the rc jet boat collection ago
Bf6f2270fe703ae44ce35e53fbe2da7c?default=blank&size=40BokC added this to the RC collection ago
Bb75da4d7e6f900f5f6d759169083cb1?default=blank&size=40Jotham B commented ago

Ok. Strange, if I click it, it just goes into edit mode.

Could you PM me the part or publish it on youmagine and link it here?

219b355d08034aa3a88311a3dade2092?default=blank&size=40abitencrypted commented ago

Hi Jotham,

No link to collaborate at my end. I'm thinking collaboration is something that you will have to action from your end and an invite will come to me.

Bb75da4d7e6f900f5f6d759169083cb1?default=blank&size=40Jotham B commented ago

Thanks howard, that'd be great. If you click the "collaborate on this design" near the top right of the page I think it will let you edit the page, or it might send a approval request to me. Then you can add the STL file.

219b355d08034aa3a88311a3dade2092?default=blank&size=40abitencrypted commented ago

Hi Jotham,

I've had to modify the motor mount to take a Turnigy Aquastar water cooled 3660-1700KV. I have the modified STL to share but not sure how to post it here. Let me know if you want it. Maybe PM it to you.


B2d987bcc85ee8aa33c9443404291371?default=blank&size=40Mahdi Khoshnood added this to the 3d printer collection ago
F297325b8076532b43f02d927b7762bd?default=blank&size=40amidar added this to the RC collection ago
219b355d08034aa3a88311a3dade2092?default=blank&size=40abitencrypted printed this ago
Carousel thumb wp 20180909 13 16 28 rich
Printed on:
original prusa i3 MK2
Used original Prusa i3 MK3 (not available in available options) Excellent. Really good job made of the design by Jotham.
No issues printing this model. I added a few 1mm thick tabs to help align the hull sections when gluing with supper glue. See photo which is ready for finishing and painting.
Bb75da4d7e6f900f5f6d759169083cb1?default=blank&size=40Jotham B commented ago

I generally use about 20% infill and set it to use 3 perimeters. This results in almost all the hull being solid. I use super glue to join the parts. I did one in ABS and used acetone slurry which works very well. Cheers : )

219b355d08034aa3a88311a3dade2092?default=blank&size=40abitencrypted commented ago

Great work.

I've been 3d printing for 9 months, the last 3 with a new Prusa i3 Mk3. I thought I would give your boat a try. Wish me luck:-)

I hope you don't mind if I ask a couple of questions relating to a PLA printed version -

1. What percentage in-fill did you use?

2. What adhesive would you recommend for bonding the hull parts?



E5771b0008152dc343d1a898da5272a2?default=blank&size=40sph130 added this to the Print This collection ago
F6c2b80053cf43c103a4d15a2e036e27?default=blank&size=40marcofaby.73 added this to the Modellismo collection ago
D2c949762d189f0b75a915817b3b7adc?default=blank&size=40printerz added this to the Drone collection ago
Bbf00b3825fd578fcafe2d1f6088da8c?default=blank&size=40moroziller added this to the Misc collection ago
Bb75da4d7e6f900f5f6d759169083cb1?default=blank&size=40Jotham B published this design ago