M-Jet Sprint - 3D Printable RC Jetsprint Boat Model

M-Jet Sprint - 3D Printable RC Jetsprint Boat Model 3D print model


Join the official M-Jet facebook group! https://www.facebook.com/groups/623045356071128

Note: This is not a physical product. After purchase, you can download computer files which you can use to manufacture your own parts on a 3D printer.

Fully functional and complete RC boat model. All parts including the jet pump and pilots are included.

You get 18 STL files for 18 parts of the boat, designed to be FDM 3D printed, 16 of them with no supports. You also get a STEP file of the whole boat, ready to be edited to your needs.

You can 3D print it and assemble it with help of the manual, link below. You need to buy all electronics, screws and other necessary parts yourself - part list is in the manual, too.

COMPLETE PDF MANUAL: https://drive.google.com/file/d/1JXAqPCIegU0TW2XvNSiWBZ-T3o3yTSlP/view?usp=sharing

Includes part list, printer requierements, print settings, assembly guide.

M-Jet Sprint overview

1/10 scale, 39cm hull length. My boat weights 1200g, the weight depends on the electronics you choose.

Two stage jet pump, meaning it has two impellers. 27mm diameter. The pump is integrated into the hull body. It achieves very consistent performance and has no issues with priming, like many single stage pumps do. My impeller mounting system does not use any glue or grub screws, therefore makes the maintenance very simple. All thrust is absorbed into a thrust bearing, there is no force on the motor shaft. It is based on my M-Jet 30 jet drive and shares the key features with it, read reviews here: https://www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-3d-printable-jet-drive-for-rc-boats

Integrated watercooling: Both inlet and outlet for your watercooling loop are integrated into the design.

Self righting works thanks to a flood chamber - a chamber that gets filled with water when the boat flips over. The side with the chamber gets heavier and flips your boat back. When driving forward again, all the water flows out.

Optional pilots and V8 engine are included in the STL files.

Integrated mounts for the motor, battery, ESC and receiver.

Motor choice: You can use up to 3660 size brushless motor. Read more in the manual.

Please note that this final version of the M-Jet Sprint does not contain the receiver drybox anymore, which was seen in my one of my previous youtube videos showing the development of this boat. After testing the drybox, I found out it would not work as I intended - water was getting inside anyway and it was taking too much space. Therefore I reworked and improved the main cover seal of the hull and removed the drybox completely. Now I recommend just using a plastic bag, which in combination with the new main seal works better overall.

Update 27.03.2021: The Motor choice section in the manual was edited after testing more motors with the boat.

Update 25.04.2021: A new folder Mods_for_M-Jet_Sprint was added to the files. It includes new modifications of the boat design with some ideas coming from the community, which suit different needs. Added mods: thicker hull mod, thicker cover mod, ride plate mod.

Update 02.08.2021: New boat stand by Landon_L was added to the Mods_for_M-Jet_Sprint folder. Thanks for sharing!

Update 10.08.2021: New bilge pump mod by Landon_L was added to the Mods_for_M-Jet_Sprint folder. Thanks!

Update 14.9.2021: New single blade impeller design mod was added to the Mods_for_M-Jet_Sprint folder. This impeller design was not tested on this pump yet, but was found to dramatically improve efficiency on a different pump. Feel free to try it and leave feedback!

Update 06.05.2022: New extended long ride plate mod by Landon_L was added to the Mods_for_M-Jet_Sprint folder. Thanks for sharing!

Update 31.07.2022: New thicker hull with bilge pump by Justin Janes was added to the Mods_for_M-Jet_Sprint folder. Thanks for sharing!

Update 13.8.2022 Thanks to Macandnews, we now have a manual in French language! Thanks for your work.

Update 23.8.2022 New longer hull for bigger motor or battery by Justin Janes was added to the Mods_for_M-Jet_Sprint folder, thanks again!

Update 18.11.2022 Modified steering rod for thicker servo arm was added into the Mods_for_M-Jet_Sprint folder.

Update 04.03.2023 Pilots with separate heads for easier painting were added into the Mods_for_M-Jet_Sprint folder.

Update 20.03.2023 Pilots with separate heads, as well as separate rollcage piece, were added into the Mods_for_M-Jet_Sprint folder.

Fix 18.04.2023 Some users reported missing mods in the mods folder. The latest version of the mod folder Mods_for_M-Jet_Sprint_18.4.2023.zip was uploaded to ensure proper function.

Update 03.06.2023 STEP file of the whole boat was added into a new folder M-Jet_Sprint_STEP_file.

Update 27.06.2023 Modified version of the longer cover by Jeff Jackson was added into the mods folder. A steering rod for a TRX servo by KpopRC was added as well. Thanks for sharing!

Update 14.09.2023 A new ride plate mod by Alexander Binninger was added into the mods folder. There are now 3 different ways to use a ride plate, all reorganized in a Ride plate mods subfolder. Thanks for sharing!

Update 18.09.2023 A new txt file FAQ_M-Jet_Sprint with answers to frequently asked questions was added to the files.

Update 19.09.2023 Thanks to the help of Andrew Westrop and Daniel Chapman, steps were made to fix an error with the cover lid size in the Longer hull mod. There are now two versions of the lid for the standard and bilge pump hull version, which should work better than before.

Update 27.11.2023 A paint handle by Dana Hager for holding the hull during painting was added to the mod folder. Thanks for sharing!

Update 04.02.2024 A new improved long ride plate mod by Peter Maurits was added into the mods folder, thanks for your design!

Update 12.02.2024 Two versions of a front bumper were added into the mods folder.

Update 12.02.2024 (new) Multiple versions of a hull with turn fins by Peter Maurits was added into the mods folder. Thanks again for your great work.

Update 13.02.2024 A new ride plate version by Peter Maurits for the thicker hull was added into the mods folder, thanks.

jigubue 2024-02-07 19:43:25 UTC
Has anyone used the Paint handle by Dana Hager? I'm confused on assembly. Does anyone have a picture of it in use?
M-Jet-Development 2024-02-07 20:33:28 UTC
This might help: https://www.facebook.com/groups/623045356071128/permalink/923968059312188/?ref=share
dkilbane1 2024-01-18 16:42:39 UTC
I'd like to build this but I'm not sure the A1 mini will fit it. The build capacity is 180x180x180. I see the build volume on this is needed to a height of 200mm. Do you think I can squeeze it in before I purchase the plans?
M-Jet-Development 2024-01-18 18:00:48 UTC
The tallest part is 198mm tall. You would have to somehow split the hull in Z axis and then create a storng joint. It is doable, but significantly complicates the build. Maybe if you could use a piece of fibreglass to lay over the joint, you would get it strong enough.
dkilbane1 2024-01-18 18:07:56 UTC
Ah ok. This is my first RC build with the 3D printer and that may be a bit complicated for my first attempt. I'll try and find a model that fits my build volume and once I get more experience or a bigger printer I'll try this one.
greatbigste 2024-01-15 11:53:11 UTC
Hello, as i am not a lover of smothering my prints in epoxy to try and get them something like smooth, I was wondering if it could be resin printed ?? Probably a much better finish and higher print accuracy ?! Do you have a dedicated file or could I just pass the STL file through my slicer ?? Has anyone else resin printed it ? I would like to know before purchasing the file for this great model. Many Thanks, Ste.
M-Jet-Development 2024-01-15 13:41:36 UTC
Hi, firstly, there is no need to apply epoxy on anything apart from the glued joint. The boat runs fine with the hull having visible layers from the printer. I only used a clear coat to seal the hull. Regarding a resin print - I have no experience with resin printers and can only speak from the information I saw everywhere. I would be concerned about durability of the resin print, since its mechanical properties might be underwhelming compared to the FDM process - check for example ultimate tensile strength on the material sheets, which for FDM ranges roughly around 50 MPa in XY and 25 MPa in Z. Second concern about a resin print is infill - I suppose the resin print cannot have less than 100% infill. This might cause trouble with weight in some areas. Also, this is a problem if the resin print has higher density and might cause the boat be too heavy. Third, all tolerances on the model, such as holes for bearings, are designed for FDM shrinkage, so with resin printer the slots might end up too free. There is no dedicated resin STL for this. However, this above naturally depends on the resin you choose. These effects should be paid attention to, but if you choose the resin well and keep all these issues in mind, you might be able to succeed. There were a few people who printed the pump in resin successfuly, and I also remember one person printing the entire boat in resin successfuly. Hope this helps. Stepan
chjohnson 2023-12-21 08:51:01 UTC
Hi, excellent work with the jet. I appreciate your dedication to the project and engaging presence while addressing people’s comments. I have built and run the M-Jet Sprint with the 27mm pump which generally works great, but have experienced the following issues: 1. Even though I have applied epoxy over the entire hull, with multiple coats over the seams, water leaks in; I had to install a small pump to push water out of the hull through the cooling exit hole, which works out, though it adds weight. I am guessing water is entering through the lid and perhaps some through the seams near the jet nozzle despite the rubber o-rings. How would you recommend fixing this? 2. There is some porpoising at speed — perhaps a longer, angled ride plate would help? 3. I am using the Fly Color 90 amp ESC with a KingVal 3050kv motor and a Turnigy Nanotech 4S 2200mah battery. With moderate driving, it lasts 3 minutes until it drains completely flat. Lastly, I would like to scale up the model into order to fit a larger battery pack and increase runtime (while keeping the same motor and esc where possible); would you recommend I scale everything and reduce the size of the cooling / screw holes, or scale only the hull and fit the existing M-jet 27 or perhaps M-jet 30 on there? (I am guessing that simply scaling up the pump will mess up the ratios between its dimensions and therefore its fluid dynamics.) As of now I have 1.5x scaling; looking to see what is an optimal size to achieve a similar speed / performance to the existing craft along with a long runtime.
Item rating
64 2
andybra 2024-02-02 09:13:51 UTC
Looks great but still building it so can’t judge the finished item. Looks very promising.
M-Jet Sprint - 3D Printable RC Jetsprint Boat Model
Editorial No Ai License 
M-Jet Sprint - 3D Printable RC Jetsprint Boat Model
Editorial No Ai License 
Response 93% in 1.6h

3D Model formats

Format limitations
  • PDF (.pdf) (3 files)97.1 MB
  • Stereolithography (.stl) (3 files)73.9 MB
  • STEP (.stp)3.78 MB
  • 3D Manufacturing File (.3mf)53.8 MB

3D Model details

  • Publish date2021-03-23
  • Model ID#2941615
  • Ready for 3D Printing