Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4819686.

When I first started out, I felt like it was a huge pain in the ass as well as a waste of filament trying to find a direct drive solution for my Ender 3 that would work with any of the standard available cooling solutions such as the Hero Me etc. I decided to remix a couple of things available here on Thingiverse and come up with an all in one set that is designed to work with mostly stock Ender 3 parts coupled with an E3D Titan extruder and pancake stepper. This is a lightweight direct drive solution that will help minimize ringing. 
I started with the Red Squirrel Hobbies duct here
https://www.thingiverse.com/thing:4170231
And the Titan extruder mount available here
https://www.thingiverse.com/thing:3369418
I did a bunch of tweaking to get the two parts to interface as seamlessly as possible. I printed the extruder mount at 100%infill and the duct at 20%. This is strictly an endstop only setup. I have tried auto bed levelling and prefer to manually level my bed.

Ender 3 Direct Drive with Cooling for E3D Titan

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4964662.

This a complete chassis for Drommon's King Axles. It is centered around the use of a Wheely King transmission and shock towers (what I had on hand, fairly easy to find). Printed in PLA at 100% infill and 0.2 layers. Uses RC4wd M3/M4 rod ends and 20mm M4 set screws for the links.The cage is optional and gets in the way of battery installation but looks good. It is designed to use shorty lipos (again, what I have on hand). The center driveshafts are from a 3.3 T-Maxx. The one piece chassis plates require a 300x300 bed to print (CR-10). If anyone has an RC4WD SCS transmission and feels like modelling it I will update this chassis to incorporate that as well.

Shogun Chassis for King Axles

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4755207.

2.2 RC Monster Truck Beadlock. 3 different offsets to fit a wide variety of models that use a standard 12mm hex. The truck pictured is an HPI Wheely King. These are specifically designed to fit JConcepts 2.2 tires, ie the Renegade Jr, Fling King Jr, and Midwest. They will probably fit Proline tires but you may need to trim the bead a bit for best fit.
Hardware List per Wheel
6x M3 x 10mm (planetary cover)
6x M4 x 12mm (center hub)
I printed these at 100% infill in PLA. Temps 215/60 to ensure maximum layer adhesion.

Update 2/15/21
I uploaded a new set of hex hubs with better clearances that should fit on the 12mm hex far easier.

Updated 8/12/21
New v2 design for more durability plus a new offset adapter.

2.2 RC Monster Truck Beadlock

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4785252.

This is a set of 2.2 dish wheels that I designed for use on the Tamiya Hornet, Grasshopper, and Frog. I print them at 100% infill and 0.1 layers.

Tamiya Hornet, Grasshopper, Frog 2.2 Dish Wheels

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4779520.

2.2 Buggy Wheels. 12mm Hex. Front wheel is 28mm wide. Rear Wheel is 41mm wide. 2.2 2wd buggy tire from JConcepts and Proline fit.

2.2 2wd Buggy Wheels 12mm Hex

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4744070.

This is to use Losi LMT wheels and tires on trucks that use 12mm hexes, such as the Wheely King, SMT-10, MST MTX-1, etc. One adapter maintains the same offset as factory and the other adds 10mm of offset. Designed to fit up to an 8mm socket. Print at 100% infill.

Edit 2/21/21: Updated designs. Added 20mm offset.

Losi LMT Wheel to 12mm hex adapter

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4905568.

This is an adapter to run a linear rail on the X-Axis of your Ender 3/3 Pro coupled with a BIQU H2 direct drive extruder. The needed hardware is as follows:
10pcs M3x6mm button head screws
4pcs M3 T-nuts
There is no modification necessary to the end stop for the x-axis. Mount the linear rail with 4 of the screws and the t-nuts. Then, mount the adapter to the carriage on the linear rail using 4 more screws. Finally, remove the rubber stopper and slide the assembly all the way to your right and install the last two screw through the adapter and in to the BIQU H2 from behind. Now, you need to connect to the printer with a pc or through a raspberry pi and send the following commands to re-center the build volume.
M206 X-4
M206 Y-10
M500
Make sure you hit enter after each command and don't skip the M500 as it saves the settings to firmware. You can adjust the Y offset a bit if you find that your Y end stop position differs from mine which will affect the centering. If your build is closer to the front of the plate use a larger negative offset, ie Y-12 etc instead of my Y-10. I try to run a bed leveling test that puts a square at each corner with a skirt to make sure my end stop and offset is correct. If the offset is too much you will hear the belt skip when the bed travels all the way forward. Kill the print and change the offset and try again. My goal was to make this as easy as is reasonably possibly.
Linear rail should be positioned so there is 15mm between the end of the rail and the black plastic of the end stop. You will have to remove the rubber stopper from the left side of the rail but leave the right side in after you have assembled everything.

Ender 3 Linear Rail Mount for BIQU H2

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4788413.

Here's a set of 2.2 wheels for the Tamiya Grasshopper 2/II. You have to use the old 5 pin style drive hub found in the kit or print a set of them from here:
https://www.thingiverse.com/thing:4159329
These are the same as my wheels for the Hornet but with a different rear offset to suit the Grasshopper 2/II.

Tamiya Grasshopper 2 II, Super Hornet 2.2 Dish Wheels

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4788382.

A set of wheels for the Tamiya Blackfoot. Similar appearance to stock.

Tamiya Blackfoot Wheels 6 Hole

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4899387.

Every single mount for the stock Ender 3 carriage has the holes misaligned. I cleaned up this design and made the mounting holes line up properly. I also modded the mount a bit so I could mount a 40mm cooling fan on the heatsink using a single screw in the bottom corner. Print at 0.2 and 100% infill.

BIQU H2 Ender 3

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4960782.

This is an enclosure I came up with to house the main board and a Raspberry Pi Zero WH for my Ender 3 after updating to Klipper firmware. Klipper does not utilize the main board sd slot so I made a nice uniform front face. I also made the enclosure accessible from the top or the bottom. It uses a 4020 fan that is just slid down over the pins. This has worked well for me with the fan pulling air down and out of the enclosure. I printed at 10% infill, 0.2 layers, 4 bottom 5 top layers, 2 perimeters.

Ender 3 Klipper Enclosure Pi Zero

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4871397.

Boat Stand for Sergey's RC Boat. Will Work with other v-hull rc boats from around 20" to 40" length. Printed in PLA at 215 with 10% infill and 0.2 layer height.

RC Boat Stand

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4934434.

Print at 100% infill. You will want to install the stock bed carriage without the wheels on to these blocks. Keep all the bolts loose and then tighten them incrementally while sliding the bed fore and aft to ensure proper alignment and free motion. 

Ender 3 Pro Y-Axis Linear Rail Adapters

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4640453.

I printed the chassis and wheels that Matt designed for use with Clodbuster axles and tires found here.
https://www.thingiverse.com/thing:3347976
While I am completely stoked with the overall build I felt that the center of the wheel was missing something so I decided to design a planetary cover to hide the hardware in the center of the wheel. It's a simple press fit over the axle nut assuming you are running axle nuts like these:
https://www.ebay.com/itm/Metal-Nuts-For-1-10-RC-SCX10-WRAITH-12mm-Wheel-Hub-Hex-Drive-Adaptor-25mm-Offset/402385094448?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649


Clodbuster Planetary Cover

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4646519.

I have printed and run several of the upper link mounts that are floating around and have broken every single one. They rely too much on layer adhesion for strength. So I designed this one to literally hook the gear box and use a single screw with a recessed nut to secure it. Print at 215C with 100% infill for maximum strength. I added a 3mm hole in the bottom of the mount to secure a rod style rear lock out or you can print the one pictured from my other files.

Clodbuster Upper 4 Link Mount

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4641836.

This is  a stand designed for solid axle monster trucks. There are 2 different width bases included. One for Clodbuster axles and one for AR60 axles. The Clodbuster width regular base is designed so the stand should be able to accommodate either 4 links or ladder bars. For axles other than the two listed you may have to scale the width of either base to get the proper spacing you need in your slicer. Just make sure to uncheck uniform scaling to avoid affecting the height and depth. The pictured stand is a one off for a project I am working on but is overall indicative of the design. The needed hardware is 4 - M3x20mm button head screws.

Update 11/17/20: Added Several chassis/axle specific bases. More to come as time permits.

Solid Axle Stand

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4718047.

Axle stand for the Losi LMT. You need 4 of the uprights, 2 bases, and 8x m3x16 screws.

Losi LMT Axle Stand

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4737943.

Set of stands for the Tamiya Blackfoot. Print 4 uprights and 2 basses. You'll need 8x m3x16mm screws.


Tamiya Blackfoot and other ORV chassis stand

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4646503.

Rear steering lock out plate for the Clodbuster. You can run it as shown or flip the knuckles side to side and run it lower. I like the way shown because it has better ground clearance. Printed at 100% infill at 215C.

Clodbuster Rear Lock Out

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4655009.

I needed some diff retainers for a set of AR-60 axles I am building and only had some smaller ones from an SCX-10 that wouldn't fit. These fit the bill nicely. Printed solid in PLA at 215C.

Edit 11/16/20: I realized I juxtaposed two measurements in the original part. Fixed and re-uploaded.

Axial AR-60 Differential Bearing Cap

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4933164.



Ender 3 Bed Level Test

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4879665.

Trim tabs for a Proboat Power Boat 17. Print at 100% infill.

Proboat Power Boat 17 Trim Tab

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4933167.



CR-10 Bed Level Test

This a complete chassis for Drommon's King Axles. It is centered around the use of a Wheely King transmission and shock towers (what I had on hand, fairly easy to find). Printed in PLA at 100% infill and 0.2 layers. Uses RC4wd M3/M4 rod ends and 20mm M4 set screws for the links.The cage is optional and gets in the way of battery installation but looks good. It is designed to use shorty lipos (again, what I have on hand). The center driveshafts are from a 3.3 T-Maxx. The one piece chassis plates require a 300x300 bed to print (CR-10).

Chassis Plate 1.stl

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tbmallow

Ender 3 Direct Drive with Cooling for E3D Titan

Shogun Chassis for King Axles

2.2 RC Monster Truck Beadlock

Tamiya Hornet, Grasshopper, Frog 2.2 Dish Wheels

2.2 2wd Buggy Wheels 12mm Hex

Losi LMT Wheel to 12mm hex adapter

Ender 3 Linear Rail Mount for BIQU H2

Tamiya Grasshopper 2 II, Super Hornet 2.2 Dish Wheels

Tamiya Blackfoot Wheels 6 Hole

BIQU H2 Ender 3

Ender 3 Klipper Enclosure Pi Zero

RC Boat Stand

Ender 3 Pro Y-Axis Linear Rail Adapters

Clodbuster Planetary Cover

Clodbuster Upper 4 Link Mount

Solid Axle Stand

Losi LMT Axle Stand

Tamiya Blackfoot and other ORV chassis stand

Clodbuster Rear Lock Out

Axial AR-60 Differential Bearing Cap

Ender 3 Bed Level Test

Proboat Power Boat 17 Trim Tab

CR-10 Bed Level Test

Shogun Chassis for King Axles