Dimensions: 26x81x30cm - 10x32x12"
Weight: 9.9kg - 21.8lbs
Suspension: Independent Swing Axle
Propulsion: 775 Motor
Electronics: All Custom
Top Speed: 7 km/h - 4.3 mph
Climbing Angle: 49° - 115%
The one thing that the OpenRC lineup has been missing so far is a trial truck or rock crawler. In normal OpenRC fashion, this truck is also in 1:10 scale. The entire truck is developed in Fusion 360, and all of the source files are provided, so they can be easily modified. This almost fully 3D printed trial truck is definitely the most complicated RC car available in the OpenRC lineup, as it has 133 files, some of which are printed multiple times. The assembly of the truck requires very exact tolerances, and for that reason pretty much everyone making one will have to change the parameters and re-export all of the parts to match all of the size tolerances. The changing of these parameters has been made extremely easy, as all of these parameters are easily changed through the "Change Parameters" tool in Fusion 360. All of the parts take about 250-500 hours to print depending on print settings of course.
Daniel Norée for making OpenRC in the first place,
Pawel "Sariel" Kmieć for introducing me to truck trial, and finally
Yorai "Yoraish" Shaoul for making the Tatra T813 my favorite car of all time.
The OpenRC Trial Truck is definitely the most difficult out of all OpenRC cars to make. This is absolutely not a project for beginners. You better not start printing or ordering parts before you decide on building one. With that said, all of the parts required for this truck can be printed on pretty much any printer with a 20x20cm or bigger print area. I myself have a cheap prusa mk2 clone, and I have been able to print every part with close to no issues. All of the parts have been designed with printing in mind, so they should be as easy to print as possible, while being as strong as possible.
You will need Fusion 360 in order to make one of these. Begin by printing the size index parts and changing parameters in the OpenRC Trial Truck Size Index.f3d file, until you get all of the tolerances just as described in the file. This will save you a lot of trouble down the line when you are assembling and troubleshooting. You will then transfer these parameters into the OpenRC Trial Truck Individual Parts.f3d file. This will take you a large amount of time, but it will be worth it when you are printing all the parts. You will have to do this for the gears in the gearboxes, as the size tolerances on those are quite tight. The majority of my building tips are quite long-winded, so they will be put in a video at some point.
Order of Progression
1 - Rear swing axles
2 - Transfer case
3 - Front swing axles
4 - Gearbox
5 - Cab
6 - Cosmetics
Can I buy one?
How much plastic does it use?
You will need at least 2kg of PLA in order to print all of the parts.
How long does it take to make?
My best guess would be 100-500 hours.
How much money does making one cost?
You should be able to make one for less than $250 if you already have the tools.