Okay sir. Thanks for your reply. I will surely try FreeCad. I will try to start off with that software soon. 🙂 

I just recently acquired a printer (FLSUN 5Q) without any experience of using one at all. It is many many years since I did any technical drawings but I wasn't really interested in printing other people's designs. I did try TinkerCAD as it was supposed to be 'intuitive' but I found it quite difficult to get my head around it. As Ruplicator notes, and I read this in several reviews, TinkerCAD quickly shows its limitations. So having read the very positive reviews of FreeCAD I decided to start up the learning curve. With the help of some excellent tutorials on YouTube, DrVAX, and FreeCAD Academy were the two main ones I used, I a can now produce an STL file for printing that produces parts reasonably aligned with my intentions. Using FreeCAD was a bit frustrating to begin with but the Eureka moment does come and it does not take so long to arrive.

I recommend large quantities of coffee and thick carpet to chew on during the initial stages.

Fusion 360 is free and is very powerful. However, the learning curve is quite steep. If you are thinking of potentially doing CAD design professionally this could be a good choice.

TinkerCAD is at the opposite end of the scale. It is more intuitive to use but lacks some of the more advanced features. However, I have used it to create some relative complicated designs very quickly with with little time invested in learning its use.

FreeCAD, although I have not used it and only watched tutorials seems to be somewhat in the middle. It also has the advantage of being supported by a freeware group that is unlikely to stop the "free" part of the software and upsell you to a very expensive CAD package. This is the most likely software I will switch to when I get fed up with TurboCAD's price increases (my first TurboCAD package cost $39, now it's $200)

There are many other CAD packages available that other members have more experience in their use and can comment on.

So, which software do you recommend a beginner for creating designs for 3D printing? 

I have heard about AutoCad, Fusion 360, Solidworks, Inventor, etc. 

Which one should a beginner learn? 

Given the tank design didn't need to send any information back to the controller I chose the very inexpensive (less than $3.00 w/ shipping ) transmitter and reviver from Banggood. 

I was expecting this to be the most problematic aspect of the build but was very delighted with the range, its forgiveness of voltage fluctuations and noise tolerance when used around microcontrollers and brushed motors. Using the Radiohead library made it very simple to send the joystick values from the controller to the tank.

Yes, TurboCAD is another design CAD software that has been around for a while and at one point was very reasonably priced. Given all of the quality free CAD software out there now I wouldn't recommend TurboCAD for 3D printing for someone starting to learn CAD. I have an older version (2017) and it has a few quirks especially when it creates STL files for the printer. But as with a lot of things once you get use to something one way it is difficult to justify the time to learn a whole new method so its my go-to design software.

Thanks 😀 

By the way, the software you used was Turbocad. Is it equivalent to Autodesk AutoCAD Mechanical? 

Or any other AutoCad type?

I'll be happy to help any way I can.

Then, I will start off with 3D printing and modelling such remote controlled bots. 

I will need the much required guidance for my future projects from this Forum.

Hope you will help me. I might just ask a few doubts and questions. 🙂