Introduction: 3D Printed MB Jeep and M416 Trailer in 1:10 Scale

Picture of 3D Printed MB Jeep and M416 Trailer in 1:10 Scale

Introduction

If you haven't experienced the world of scale RC crawlers then you are really missing out, there is something really theraputic about tackling the same impossible lines until you eventually crest that hill.

One of the great benefits of crawling is that cars can be elaborately detailed without risking being destroyed in a high speed crash (low speed tumbles down cliffs are of course another story).

The downside of crawling is that it is horribly expensive to get a good-looking scale rig. I'm hoping to provide a solution to that.

I used a cheap 1:18 scale RC crawler (A clone of the more expensive Losi MRC) to supply the drivetrain (it could provide the electronics too if you are new to the hobby and don't have a pile lying about) and built a realistic 1:10 scaled MB Jeep around it (The MB jeep is tiny in real life, hence why so-called 1:18 parts work at 1:10 scale).

Features and Design Goals

  • Complete assembly without glue
  • Replaceable panels (for inevitable crashes)
  • True 1:10 scale (most "1:10" RC's are not, since they have a common wheelbase)
  • Electronics hidden in engine bay
  • Working printed suspension
  • Affordable
  • Reliable (hence the choice of off-the-shelf axles)
  • Print without supports
  • Printable on hobby printer (250x200x200mm bed)

STL Files for Printing


Non Printable Jeep Parts

Wheels

  • M2x10 screws (5 each)
  • M2 nuts (5 each)
  • 1.9 Tyres (I just used the Kulak's tyres)

Trailer Parts

Trailer

  • M2x5 (20)
  • M3x40 (1)
  • M2x10 (24)
  • M2x16 (6)
  • M3x12 (2)
  • M3 nuts (3)
  • M2 nuts (50)

Wheels

  • M2x10 screws (5 each)
  • Tyres (AsiaTees) (Or just use the Kulak's tyres)
  • M2 nuts (5 each)

Consumables

  • Filament, I chose PETG for durability and layer adhesion
  • Primer: Rustoleum Ultra Cover
  • Olive Drab Paint: Tamiya TS-28

Step 1: CAD Work: Fusion 360

Picture of CAD Work: Fusion 360

CAD Tool: Fusion360

Autodesk's Fusion360 is in my opinion the best thing that has happened to CAD for hobbiests in recent years. It is incredibly powerful and improving every day (No I'm not paid to say that, unfortunately, I just am a huge fan).

Get it here, it is free for hobby use (or even light commercial, go have a squizz at the license)

Source Material

Fortunately the internet is chock full of source photos of the MB Jeep, so I collected a few. It was also easy enough to find the true dimensions, so I used those to scale the canvases that I imported into Fusion360.

Design Considerations

Unlike my hotrod project, which was designed to be printed in SLS nylon, I took pains in this project to make it easily printable on a hobby-grade FDM printer.

Nozzle Diameter: Since most of the body is comprised of thin wall features I designed them to all be exact multiples of my nozzle diameter (0.4mm) so that they could be printed in solid continuous lines.

Parameters: Make sure to include all important dimensions (wheelbase, wheel diameter, length, width,scale, bolt diamters etc.) as parameters (tutorial) and define everything with respect to them. If you do this carefully enough you will easily be able to make sweeping changes later, such as changing the scale altogether, the nozzle diameter or the size of the screws used.

Tolerances: When making a hole for a screw, for example, it makes sense to define it with an additional tolerance defined as a parameter, then you can easily change the parameter if the holes are too big or too small.

Step 2: Finishing and Painting (Trailer and Jeep)

Picture of Finishing and Painting (Trailer and Jeep)

Sanding

The reason I put the finishing&painting step first is that it is far easier to sand the parts individually before assembly.

Especially on the flat parts the print lines can easily be removed (or mostly removed) by rubbing the parts against some 100-grit sandpaper placed on a flat surface.

Mask the Nuts

In case you have already inserted the nuts, but not the screws, make sure to mask them off to prevent the threads getting clogged by paint. The easiest way is to just temporarily insert screws (long ones that are easy to get out).

Primer

Make sure that you use a primer suitable for the plastic that you are printing, I found Rustoleum's "Ultra Cover" primer to work well (it promises to "also bond to plastic" on the tin and seemed to live up to it)

Painting

For the military themed trailer and jeep I used Tamiya TS-28, it took two tins for the jeep and trailer combined.

Step 3: Print Trailer Parts

Picture of Print Trailer Parts

Nozzle Diameter

I designed all of the thin-wall parts to be multiples of 0.4mm for printing on a 0.4mm nozzle. Besides the frame rails , where I use about 40% infill, everything will be "all walls", so make sure that you use enough (I normally set the slicer to use 6 or 8 walls).

Orientation

In the attached images you can see the orientations that I used to print all of the trailer parts.

Supports

None of the parts should require any supports, although the recesses in the hitch triangle may come out cleaner with them enabled.

Brims

You may find it helpful to use a brim on the tub when printing it vertically.

Layer Height

Since there are almost no curves you will get just as nice results, a whole lot faster, by printing with 0.2mm layers.

Step 4: Assemble Trailer: Frame and Tub

Picture of Assemble Trailer: Frame and Tub

Insert Nuts

Start by inserting M2 nuts into all of the holes in the main frame. If the holes are too tight then simply use a soldering iron to heat them up and press them in, which has the added benefit of "gluing" them in place.

There are also nuts to be inserted in the hitch triangle.

Attach end-caps

Use the M3x5mm hex bolts to fasten the two end-caps to the trailer tub. You need to use hex screws so that you can use an "L shaped" allen key inside the trailer with the nuts on the outside.

Attach Triangle

It is best to attache the triangle to the frame before the suspension brackets, otherwise things can become very tight.

There are two screws which pass through the side of the frame, fastening into captive nuts in the triangle.

Attach Tub and Suspension Brackets

Assuming that you have inserted all of the nuts into the frame you can now attach the tub and the suspension brackets in any order. It is safest to to the suspension brackets first, so that you can be sure the screws aren't too long (otherwise they will press against the floor of the tub).

Axle Rod

Insert the ~160mm threaded rod through the axle tube. The rod may have to be threaded through the tube if the tolerances are too tight, this is helpful though, because it makes it easier to tighten the wheel-nuts afterwards.


Step 5: Assemble Trailer: Hitch

Picture of Assemble Trailer: Hitch

Take a look at the attached animation. The hitch "loop" and "shaft" are reinforced by an M3x40 bolt that runs down the center, fastened into an M3 nut that is held captive in the back of the shaft.

Make sure that the shaft turns freely before you tighten it all up, you may have to sand the shaft of use a round file in the tube, especially if you have a blobby PETG print.

Step 6: Print and Assemble Wheels

Picture of Print and Assemble Wheels

Part Options

You will see that there are two options for the rear of the jeep wheels, one has "extra offset" in order to allow 1.9" wheels to clear the leaf springs.

Jeep Wheels (Driven)

  • M2x10mm bolts (5 each)
  • M2 nuts (5 each)
  • 12mm Hex (4mm hole for shaft)

Trailer Wheels (Freewheel)

  • M2x10mm bolts (5 each)
  • M2 nuts (5 each)
  • 5x11x4 bearings (2 each)

Assembly

The front and rear wheels go together in exactly the same fashion (see animation)

First insert the beadlock ring into the tyre (take a look at the cross-section picture to see what is going on inside - if it doesn't fit properly you may need to scale it and reprint), then press the two sides of the wheel in, sandwiching the tyre bead between the ring and the rim.

Fasten the two halves of the wheels with the nuts and bolts.

Step 7: Print Jeep Parts

Picture of Print Jeep Parts

Filament

I chose to print in PETG since the great layer-adhesion keeps thin vertically-printed parts strong, it is also quite tough and semi-flexible.

Nozzle Diameter

I designed all of the thin-wall parts to be multiples of 0.4mm for printing on a 0.4mm nozzle

Orientation

In the attached images you can see the orientations that I used to print all of the jeep parts.

Supports

The following on the only parts that really require support

  • Windshield (for the arms)
  • Tub (for the horizontal portion of the transmission hump only - I plan to eradicate this issue from the design in a later release)

Brims

You may find it helpful to use a brim on the hood when printing it vertically.

Layer Height

Since there are almost no curves you will get just as nice results, a whole lot faster, by printing with 0.2mm layers.

Except for the dashboard section, which has gentle curves and embossed text so a fine layer height is preferable (I used 0.1mm)

List of Parts

ApplicationQtyPart Number
Body1windshield_insert
Body1windshield_frame
Body1front_floor_and_tub
Body1tub_wall_rear_left
Body1tub_wall_rear_right
Body1grille
Body2headlamp
Body1hood
Body2rear_handle
Body2handle_side
Body1tailgate
Body1fender_left
Body1fender_right
Body1rear_floor
Body1dashboard_et_al
Suspension4leaf
Suspension4shackle_a
Suspension4shackle_b
Suspension8suspension_bracket
Axles2knuckle_rear
Axles1knuckle_front_right
Axles1knuckle_front_left
Chassis1motor_mount
Chassis1rear_bumper
Chassis1rail_front_left
Chassis1rail_front_right
Chassis1rail_rear_right
Chassis1rail_rear_left
Chassis1hitch
Chassis1servo_and_shock_supports

Step 8: ​Assemble Jeep: Frame

Picture of ​Assemble Jeep: Frame

As with the trailer, insert all of the M2 nuts into the frame. If the tolerances are too tight, use a hot soldering iron to press them gently into place (as an added benefit they will become "glued" into place when the plastic cools).

Attach the two halves of each side of the frame together, be careful with the assembly at this stage, since it is quite delicate.

Attach the two halves of the frame to the motor mount, front bumper and rear bumper. Follow the pictures closely to make sure that all of the orientations are correct. The assembly should be fairly sturdy by this point.

Attach the eight suspension brackets.

Step 9: Assemble Jeep: Body

Picture of Assemble Jeep: Body

Fastener Choice

I chose to use M1.6 screws here for mostly aesthetic reasons, they are a fiddly nightmare though, so feel free to replace them with M2 if you like.

Rear Half

There are really no tricks to the assembly, attach the rear wheel wells to the rear bed first using M1.6 screws, tapped directly into the plastic.

Front Half

Connect that whole rear assembly to the front half using M1.6 nuts and bolts in the sides and M2 nuts and bolts at the front of the bed.

Front Fenders

Although the holes in the front fenders are currently size for M1.6, I found it easier to use M2. They are mostly hidden, so it's not a major eyesore.

Grab Handles

Here I used M1.4 screws, but actually screwing them in seemed too much like hard work so I just slowly pressed them in with a hot soldering iron.

Step 10: Disassemble Kulak

Picture of Disassemble Kulak

This is the part where we rip the heart out of a perfectly good ready-to-run RC and discard the rest (or more likely keep it for future projects).

There is nothing to it besides removing screws. Collect the following and put them aside:

  • Front Axle and Servo
  • Rear Axle
  • Transmission and Driveshafts
  • Wheels (You may want to use the tyres for the trailer)

Step 11: Assemble Jeep: Leaf Springs and Axles

Picture of Assemble Jeep: Leaf Springs and Axles

Disclaimer

It should be noted that 3D printed springs are simply not as good as a bit of steel, nevertheless, for novelty sake I decided to do it. Printed out of PETG they are suprisingly effective.

Leaf Thickness

I have provided two thicknesses of leaves, one which is sturdy but really too stiff and the other which is nice and flexible, but a little delicate.

Shackle Assembly

Each shackle is held together with a pair of M2x18 nuts and bolts (or M2x16 if you use a soldering iron to press the bolts into the plastic)

Take a look at the attached photos to see how the springs and shackles go together. Pay attention especially to which side the shackles go on (the giveaway is that they attach where the frame rails are higher).

I found it best to have the "nut" side of the shackles inwards since there is very little room for an allen key on that side once the driveshafts are installed.

Axle Assembly

The axles are a simple case of taking the stock hubs off the Kulak axle and replacing them with the 3D printed ones. Make sure to use the very short screws to reattach the hubs or the screws will jam up the axle inside the housing.

Attach Axles

The axles are attached to the leaf springs with U-bolts made out of brass threaded rod. You could use stainless but it will be much more difficult to work with. Brass rod can be bent around the axles by hand and cut to length with sturdy clippers.

Step 12: Assemble Jeep: Steering Servo

Picture of Assemble Jeep: Steering Servo

Note: This is a section that I am continually reworking, it may even be best (from a steering perspective, not the "scale look" perspective), to stick with the axle-mounted servo for now. This method currently requires you to bend up a steering link from a piece of threaded rod.

Assembly

The attached animation shows how the micro steering servo (an "ALIGN Digital Servo, DS410" in my case) is attached to the support piece with 2 M2x12 screws and bolts.

Before you install the servo horn, make sure that you have powered up the transmitter and receiver, and set the servo trim to zero.

Step 13: Assemble Jeep: Drivetrain

Picture of Assemble Jeep: Drivetrain

The entire drivetrain from the Kulak is transplanted into the Jeep, held in to the mounting plate using the original four screw holes.

The only change that you will need to make is to trim about 15mm from the front driveshaft (keep the leftover pieces, they may be useful in the future to lengthen the rear shaft)

Step 14: Assemble Jeep: Headlights

Picture of Assemble Jeep: Headlights

Print

Print the headlamp pieces in a clear filament, I chose to use PETG. Varying the number of outer lines as well as whether you print the face of the lens on the bed or not will vary the look of the final lens.

Glue

I used superglue to glue the lenses into the grille as well as the LEDs into the lenses. This is quite final, so make sure you get it right!

Power

Place a 5mm LED in the back of each lens. I chose to power mine off the 5V BEC output with an appropriate (150ohm) resistor in series with each one. If you are unsure about wiring the LEDs just have a look around instructables, there are oodles of great resources.

Step 15: Assemble Jeep: Seats

Picture of Assemble Jeep: Seats

The seat frames are designed to be printed in two halves each, negating the need for support, and fastened together using M1.6 fasteners (or glue).The cushions can be made with scraps of fabric, wrapped around a square of sponge, cardboard or wood (depending how pampered your driver's butt is I suppose).

Step 16: Assemble Jeep: Install Shocks

Picture of Assemble Jeep: Install Shocks

The fender part includes two recesses into which you can install an M3 hex standoff (I used a 12mm standoff, you can vary the length to adjust the clearance) and then screw a shock mount ball screw into.

Since most crawler shocks are too long I used 60mm touring car shocks and removed the springs (we already have leaf springs, we only need the dampeners).

Comments

tonycal84 made it! (author)2017-08-31

Hi

A Few Pics of the Trailer,just completed.

The Timber Rails in the trailer are to support the water tank as mentioned in my last post.

I managed to sort out printing the large parts on my printer by adjusting the z axis downwards in my slicer program to half height then reversing the part and doing it again.

The tyres came from China, a set of 4 with 1.9 inch wheels and all the screws to assemble them, all for about £12. I didn't use the wheels but printed Ossum's.

Thank you Ossum for sharing the files, I may build the jeep as well in the future after I get the half track done

seligtobiason made it! (author)2017-06-13

I forgot to click I MADE IT! So here are a couple more pictures of the trailer.

tonycal84 (author)seligtobiason2017-08-13

hi

the trailer looks great.

I note that you cut the main frame and tub in half to allow it on your printer, I am having the same problem, all the other parts print great except these two parts.

I am a novice to 3d printing and am having trouble editting the .stl files to suit my printer. I have never used a cad program before,and am really struggling to get to grip with one. I have designed a few parts for the main vehicle (a Half Track) in fusion 360 but cannot import an .stl into it.

I wonder if I can be really cheeky and ask either yourself or ossum to post the modified files so I can print out the last two parts I need for my trailer. The trailer will be used as a water bowser to feed the half tracks water cannons (A Team type half track mod from a suitable car shape)

Thanks for your time and trouble in advance.

Tony

seligtobiason (author)2017-05-15

Hello Ossum, I love you work! I want to print this out but was thinking I would just use the body and drop it onto my Axial SCX-10 chasis. Do you know the wheel base of your print? If I knew that I would be able to scale it to the appropriate size to fit my wheel base. Thank you so much!

ossum (author)seligtobiason2017-05-15

Hi Selig, thank you, glad you like it!

I have attached an image, I hope it uploads properly... The wheelbase is about 200mm

I have seen two people on Facebook who are working on SCX10 sized ones, I think it works out to roughly 1/6 scale, but I am not sure on the exact measurements. My page is facebook.com/ossumdesigns and I often share interesting builds there.

seligtobiason (author)ossum2017-06-13

Thank you for the response and sorry about the delay in mine. I don't see an attached image so I am not sure where that one went, but knowing that the wheel base is 200mm helps a lot! Thank you!

I just put together the trailer last weekend and it looks awesome, still have to paint it up but already took it for a test run! Thank you for sharing your designs, these are awesome, should I say Ossum!

ossum (author)seligtobiason2017-06-14

No idea where that picture I attached went, but here we go again!

Thanks for sharing your trailer pic, it looks great loaded up like that.

Also, are those my jerricans? I never even considered printing the spout and can a different colour, it looks great.

seligtobiason (author)ossum2017-06-15

Sweet thank you for the picture! And YES those are your Jerry cans! I love you designs, very nice and clean. I don't know if you saw in the picture of all the Trailer parts I did have to cut the tub and frame up so the would fit in my printer. But as you can see it worked out great! I just made sure the seams were in different parts so it would help with strength on those joints!

ossum (author)seligtobiason2017-06-15

Thank you, I like to see people enjoying them, it means a lot to me as a designer when people share pics of their prints.

I did notice that you split the trailer, it came out incredibly cleanly, great job.

Timothee Gillier (author)2017-04-30

Love your Jeep!

3DTOTIRETOLS (author)2017-03-29

SUPERGOOD JOB!

rcooklock (author)2017-03-15

I ended up with 2 Kulak crawlers (long story) but one from eBay had different axels, the mounting screws for the knuckles are on raised pads. So the knuckle parts aren't even close to fitting. On the Kulak from Aliexpress it has the non-raised screw holes so the knuckles_rear part almost fits, the slot towards the crawler is too high. I will just fix the slot and make a right and left rear knuckle. I thought I should mention this for people who see this and try to build it, if the get the new axels they will have to make significant changes to the knuckles to get them to work. This is a fun project but being new to RC cars it takes me a while to figure out some of the steps (like the knuckle problem). When I get my Jeep finished I will try to post pictures.

ossum (author)rcooklock2017-03-15

Hi

Thanks for feeding back, I also wasn't aware of the different versions, but Kent Hatton ran across the same issue as you. I gave him the original knuckle files and he made some new ones that solved the problem for him, you can find them here: http://www.thingiverse.com/thing:2165216

If you run into other specific problems, please let me know, I (and others) are working on fixing all the little issues. If you are on facebook I would recommend following my page: https://m.facebook.com/ossumdesigns/ because I post all the updates that people share there.

I have also asked everyone who makes additions to post them on thingiverse with the tag "ossumjeep" so they are easy to find.

Look forward to seeing your pictures!

nite_cain (author)2017-02-18

Wow! the GIF is very clear! i can see every step of the model,how to make it?
i could not find any button in fusion360,or use other special software?

ossum (author)nite_cain2017-02-18

I'm glad that it helped. I just used the "file >> capture image" option to save a series of images.

First set up the camera where you want it, then right click on "Named Views" in the browser and select "New Named View", this lets you get back to the same place every time, in case you move the camera by accident.

Once I have taken all the pictures (and saved them with filenames with a number, e.g. screenshot001, screenshot002, etc), I import them into GIMP and use the animation options to save them as a GIF.

In retrospect I think it would be easier to use Fusion's "animation" tools though, and save as a video, I plan to do one of the jeep soon and post on my youtube channel, but it is taking me a long time to include all the nuts and bolts in the design.

nite_cain (author)ossum2017-02-19

there is a lot of work need to do.

bencini (author)2017-02-08

ok printed and partially paited! weels ordered! and Kulak disassembled!

one question... i could not understand where i have to put electronics and battery

i know i'm a bit stupid ;)

ossum (author)bencini2017-02-08

Hi bencini

I used a 2nd hand kulak that I got aithout electronics, so I used other electronics I had lying around, thought it might confuse people to show pics of that ;-)

I managed to fit it all under the hood, including a small 2S, 1000mAh lipo battery.

I think the stock electronics should all fit in there, but the battery might not. You may nees to be creative a and put it in an ammo box behind the back seats or something.

bencini (author)ossum2017-02-08

ammo box?!?! great idea !!!! thx
your project is amazing, everything goes togever like charm!!!
thanks!!

ossum (author)bencini2017-02-08

You're welcome! Please send me pics when it's done, I'd like to make a gallery of everyone's builds along with who built them and share on my Facebook page, if you are keen (https://www.facebook.com/ossumdesigns/)

If I ever get hold of a new Kulak I will add info on the stock electronics, the $100 is a bit of a stretch right now though. I'll add photos of my own electronics once I have tidied them up. I am currently using a seriously over-specced ESC from a bigger car, so the fit is a bit tight ;-)

brettt3 (author)2017-02-06

Round Two: Fight!

lol good luck man!

ossum (author)brettt32017-02-06

:-D

Normally I don't bother with the "one massive prize" contests, 'cos there is always that one insane project that was someone's thesis or something, but eventually the allure of the 3D pen drew me in.

Besides, doesn't hurt to be on the front page of entries ;-)

WannaDuino (author)2017-01-28

super IBLE.

This is pro work.

WannaDuino! Likes it.

Awesome. I just started 3D printing, got an ANET A8. i love it already.

But it`s a ton of work to learn in a short time. but i am so happy. i can say, i CAN MAKE THIS

ossum (author)WannaDuino2017-01-30

Thank you. You are right there is a lot to learn about 3D printing, but it is totally worth it.

Look forward to seeing your print, This model looks complex but should be very easy to print, since all the parts have been split up with flat for easy bed adhesion.

Just don't do to many pieces at once if you are just starting out, it is always tempting but is often not worth the risk of losing a whole batch when one parts comes unstuck.

brettt3 (author)2017-01-28

Glad you got video up... Enjoyed watching it! Congrats!

zposner (author)2017-01-24

This is so cool, I already have an rc car, but maybe I'll make the trailer.

ossum (author)zposner2017-01-24

You can never have too many RC cars ;-)

zposner (author)ossum2017-01-26

True, any videos?

ossum (author)zposner2017-01-26

Jeep video coming in a few days hopefully. This is my channel https://m.youtube.com/user/ossumtubes

Angusdog (author)2017-01-26

Wow, awesome project. I've just ordered my base vehicle from AliExpress and will start printing while I wait for delivery :) Thanks for doing all this and sharing. I'll upload pics to Thingiverse once I get it installed. Any idea where I can find a Hawkeye Pearce figure? :)

ossum (author)Angusdog2017-01-26

Great stuff!

Finding good driver figures in a true 1:10 scale is always tricky, let us know if you find one that works!

TheHerrDark (author)2017-01-25

Nice job on the Jeep, being from Butler County, PA the Jeep is a bit special to us W-PA people. If ever interested the Bantam building is still there, right on Bantam Drive. And for the classic car guys the American Austin was built there before being reorganized into Bantam.

TheHerrDark (author)TheHerrDark2017-01-25

If you have some friends that have RC jeeps come up to the http://www.bantamjeepfestival.com/
people would love to see these models maybe talk to Playthings etc. to see about sponsoring a show for them.

ossum (author)TheHerrDark2017-01-25

That sounds like a blast! I'd love to see it.

Unfortunately I am pretty much on the other side of the world, in Cape Town!

wclapie (author)ossum2017-01-26

Playthings Etc. Is a great shop(ship) The only store I have ever been in that you could drive! LMBO, It is built on the outside to resemble a spaceship and has a control panel you can play with along with all the goodies inside!

wclapie (author)TheHerrDark2017-01-26

I lived in Butler PA. I saw the Bantam and such. I like this project! Now, is there a wealthy person that can print the parts for me? Love the ideas, especially this one, but like many others I suspect, I am far from able to afford the printer.

brettt3 (author)2017-01-23

Congrats man... Love the realism!

Modern Rustic Workshop (author)2017-01-23

The prints and designs are impeccable!

randofo (author)2017-01-23

This is really cool. You should stick some LED headlights in there.

ossum (author)randofo2017-01-23

The headlamps are actually already printed, just a matter or wiring them up now. The contest deadline kind of snuck up on me ;-)

What will really amuse you is that I printed the entire jeep in transparent filament because of those two tiny headlamp pieces, everything else had to be painted!

JLangley98 (author)2017-01-23

That's awesome

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