Introduction: 3D Printed Willys RC 4X4

Picture of 3D Printed Willys RC 4X4

This is a remixed version of the original Ossum Jeep. While it is dimensionally exact and shares a few components with the original, this is an entirely different beast that is designed from the ground up to be fully 3D printed, including the axles and entire drivetrain. It is a true 1:10 scale radio controlled, full-time 4X4 Jeep.

This project started after I got in contact with Mr. Ossum inquiring about a fully printed version that did not rely on a donor RC vehicle. After learning that no plans to create such a version existed in the near future, a few ideas were exchanged, a new friendship was made and the urge to design what I had envisioned needed to be fulfilled.

The Jeep uses parts that can be bought online or at the local hobby and hardware store. Links are provided to various items on Amazon and AliExpress. The STL files are available on Thingiverse.

Files: 3D Printed Willys RC 4X4

Please feel free to visit the Limitless RC Group on Facebook if you have any further questions or just want to share your designs. You can also visit the Ossum Group if you'd like. There you can discuss the build of the original Ossum Jeep.

Thanks for your time and enjoy the instructable.

PS. I am doing my best to get this done ASAP. Please be patient and check back for regular updates.

Step 1: Materials, Components and Hardware

The following is a list of all materials and components that were used to build the Jeep. Any deviation from this list is at your own risk. If you find a better solution to something then feel free to post about it on the facebook group.The Jeep is designed to be printed in PETG for its strength characteristics and flexibility. It is also very affordable. Most of the links provided are either to Amazon or Aliexpress. You can also check out your local hobby shop but it is much cheaper to buy online from these retailers.


Materials

1kg PETG Plastic Spools - Color of choice for the body and black for the frame and drivetrain.

3mm Carbon Fiber Tubing T507LA4 - For the steering tie rod and steering column.

6mm Carbon Fiber Tubing T518Lm - This is for the axle shafts and transmission input/output shafts.

Components

Lego Technic Universal Joint, 3 Studs Long - You will need at least 6 of these.

7.4 Volt 260 Size Electric Motor - Tamiya motor must be upgraded to something that can handle 7.4V

Tamiya High Power Gearbox 72003

FlySky GT3B or Spectrum STX2 TX/RX - Only tested with these two.

20A Brushed Speed Control

Bearings - You will need around 22 of these to complete the Jeep.

Tires

Steering Servo

M2 Rod Ends

Lipo Batteries or 2X Lithium-Ion 18650 Cells or Li-Ion Battery Pack for RC

18650 Battery Holder These are optional depending on if you want to use single 18650 Li-Ion Cells instead of LiPo or the Li-Ion Pack.

JST Connector Pairs with 8" leads - Or you may use other connectors + wire. The wire must be at least 20 gauge.

Hardware

1/8" Key Stock (Square Shaft) - 2 X 12"

M4X0.70 Nuts

M2 X 4-16mm Assorted Screws - Select Cap Head

M2 X 10mm Self Tapping Socket Head Screws

M2 X 8mm Self Tapping Socket Head Screws

M2 Locknuts

M2 Threaded Inserts - These are optional depending on if you want to build the roll cage or not.

6mm ID X 12mm OD Steel Washers - Get these from the hardware store.

1.5mm Floral Wire - Get this at a craft store.

Tools

M4X0.7mm Die

1.5mm Hex Driver or Allen Key.

Bi-Metal Hacksaw Blade

Nail File or 300 Grit Sandpaper


Step 2: Front Axle Assembly

Picture of Front Axle Assembly

Please follow the instruction text in the photos. These instructions were designed to be presented in a visual format. All efforts were made to ensure accuracy and everything seen here should be repeatable by the end user. If there are any edits or future updates, they will be placed below this text in a written format. Feel free to contact me if you are having any issues with this instructable.

Step 3: Rear Axle Assembly

Picture of Rear Axle Assembly

Please follow the instruction text in the photos. These instructions were designed to be presented in a visual format. All efforts were made to ensure accuracy and everything seen here should be repeatable by the end user. If there are any edits or future updates, they will be placed below this text in a written format. Feel free to contact me if you are having any issues with this instructable.

Step 4: Engine Assembly

Picture of Engine Assembly

Please follow the instruction text in the photos. These instructions were designed to be presented in a visual format. All efforts were made to ensure accuracy and everything seen here should be repeatable by the end user. If there are any edits or future updates, they will be placed below this text in a written format. Feel free to contact me if you are having any issues with this instructable.

Step 5: Drivetrain Assembly

Picture of Drivetrain Assembly

Please follow the instruction text in the photos. These instructions were designed to be presented in a visual format. All efforts were made to ensure accuracy and everything seen here should be repeatable by the end user. If there are any edits or future updates, they will be placed below this text in a written format. Feel free to contact me if you are having any issues with this instructable.

Step 6: Frame and Suspension Assembly

Picture of Frame and Suspension Assembly

Please follow the instruction text in the photos. These instructions were designed to be presented in a visual format. All efforts were made to ensure accuracy and everything seen here should be repeatable by the end user. If there are any edits or future updates, they will be placed below this text in a written format. Feel free to contact me if you are having any issues with this instructable.

Step 7: Final Assembly

COMING SOON

Comments

JingweiL (author)2017-11-08

I'm working on building one , but the gap between parts is too big .

I have to insert a paper sheet with CA to fix it

Marty Jaxx (author)JingweiL2017-11-09

The gap between what parts? You will have to be more specific and give me more detail. I printed two of these Jeeps and others have as well and this is the first time I hear of the problem.

JingweiL (author)Marty Jaxx2017-11-10

for example , you leave bearing holes 10.4mm diameter for a 10mm diameter bearing , but it will be perfect with 10.1-10.15 diameter hole. And a 1.8mm hole for selftapping Screws will be perfect

Marty Jaxx (author)JingweiL2017-11-11

Are you printing with petg? Did you get the bearings from the exact source I posted? There are many variables here that could be causing this. I was told on the Facebook group that the holes are on the snug side. The holes are designed this way for petg and to factor in the 0.1mm-0.2mm resolution lines most people get. For me the bearings snap right in when I take the part off the printer. The bearings are 10.1X mm diameter when I checked them with the caliper.

JingweiL (author)Marty Jaxx2017-11-16

I am in China, so the parts I buy are definitely not the same source you posted.

It does not matter, I modified a few parts, and now the frame and the transmission have been completed.

Still waiting for your further instructions

Marty Jaxx (author)JingweiL2017-11-16

Follow the Ossum Jeep build for the body. It is the same body as this but this uses glue instead of screws. I will be finishing the rest soon.

jingweil it not his parts it u`r printer is not setup right

Really? I have printed the original Ossum Jeep , and made so many remix parts fot it , have no such issues

thechannelmaster (author)2017-10-14

how the transmission go together plz and thx for all u`r hard work

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Bio: Thank you guys for visiting my page. My name is Marty and I am a designer, maker, and fabricator. I have over 15 years of ... More »
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