3D Print


HOT ROD - projekt

Here you can see / order all the necessary electronics to build the model.

Here you can buy STL. the print data.

The project started almost 2 years ago when I worked part-time at Prusa Research. I was working on the development of an SLA 3D printer - PRUSA SL1.

I was motivated to create my own project and after some time of searching for what I would enjoy, I found that RC models are relatively easy and fun to both produce and assemble.

I was and still am a student, so I wanted the model to be as cheap as possible, so I ordered all the components that had to be bought via ebay (you can find a list of components at the end of the article). At a local hobby dealer, the hardware for the model would cost me many times more. All plastics are printed on a 3D printer, so they were also cheap (the price estimate for plastics is around 25 USD).

After a year of modeling in CAD, I produced the first prototype, but it had significant defects. After a year of tuning, dozens of improvements and changes, I can proudly present my project as finished. I would like to introduce him to you now.

I would also like to say that I created the whole project while studying about free time and over the holidays. I shot all the videos you see on my mobile phone with the help of my younger brother.

The maximum measured speed with anti-slip tires is over 34 km / h, you must not forget that this is a 3D printed model. Some parts are more prone to breakage. For example, driven shafts on the rear wheels. Sometimes it happens that too much transmission torque cuts them. Fortunately, you can print a new one and move on.

After a lot of tests, I found that a material called FLEX 98A must be used on the shafts that are located inside the wheels. It is flexible, but the bolt is stiff enough to withstand a large torque without bursting. It will be necessary to print 4 shafts, but printing is quite difficult, so I enclose instructions that should help with printing: https://blog.prusaprinters.org/en/how-print-with-flexible-filament_32329/

You can see orange, black and gray parts on the car. Orange and black are made of PETG (greater flexibility worse strength), gray of PLA (hard, brittle). Except for 4 shafts in wheels which are black, but from the above FLEX 98A.

If you have no equipment and you have to buy everything, it will cost you around 194 USD, or 133 USD without the sound system, tires and screws. (Plastics are not included in the cost)

You will need for this project

  • 3D printer at least 200x250x200 (Prusa MK3)
  • 1 Kg of material (PLA, PETG and a little of FLEX 98A)
  • 91 hours of print time
  • 30-40 minutes to assemble
  • all hardware parts from ebay or other source
  • screw driver with hex bits
  • some adhesive for assembling the body (two big parts) 

Rubber tires - sprint/grip

Tires were bought on ebay

+ grip, handling, acceleration, speed

- higher gearbox wear, greater chance of failure of some of the shafts

FLEX 98A tires - drift/slip

Tires were 3D printed with material FLEX 98A

+ drifts, lower gearbox wear, components wear minimally

- harder handling, lower acceleration, lower speed

Design in CAD system

Creating a model in the CAD system according to your assignment and then sending the model in electronic form.

3D plastic printing

Printing of designed models and models available on the Internet. FFF method made of PLA, PET, PETG, ABS plastic. Production machines: Prusa i3 MK3 and Prusa i3 MK2S.

3D printing of embossed photos

Lithophane photo printing. Send the photo for printing by email, we will send you a preview and after approval we will make a photo for you.

Creating a design with a prototype

Combining the two previous services, designing and then printing the design using 3D printing.

What are the limits of 3D printing?

Technology FFF:

  • Tolerance for deviation: 0.2 mm
  • Minimum hole diameter: 1 mm
  • Minimum wall thickness: 1 mm
  • Maximum part size: 210x250x200 mm

Before creating a prototype, or during its creation, you can consult:

At the email address vojtechposik@posh.cz

By phone +420 605 190 282