Making a 3D printed nerf blaster (as a complete noob)

So, I've decided to make a 3D-printed Nerf dart blaster. Why? because I bought a 3D printer. Why? because I wanted to print stuff, duh...

So, first, we need CAD software. The choices are

1. Solid Words --> too proprietary and too expensive for a hobbyist peasant like me to afford)
   NO! 
2. Fusion 360? It --> Also too proprietary. Technically free, but they recently changed so that you can only have five projects or something saved on the cloud or... I don't know!!! commercial software, right? Evil overloads, I tell you. 
   NO!!
3. Blender --> Free and open-source,
    YES!
   Sharp and, amazingly well-crafted UI that puts paid software to shame...
   YES!
   Organic modeler that made me want to pull my hair out because I might be stupid at using it
   YES! (Wait, well that's no good...)
   Moving on......
4. FreeCAD (Free and open-source,
   YES
    A bit broken and clunky (Topological naming problem... *cough* Ya ya, I know that you exist, real thunder. Though I did not know of you when I started, my bad)
   YES!!
   Did I say that it's free and open source? and that it's cross-platform :D
   SOLD!!!!!

So, FreeCAD

Since I had some experience using Blender (Thanks to Johnathan from Maker tales. Check it out if you want to learn blender. It's ridiculously good--> https://www.youtube.com/watch?v=83yNYScsRPI&list=PL6Fiih6ItYsXzUbBNz7-IvV7UJYHZzCdF&ab_channel=MakerTales)

I had sort of a head start when using FreeCAD, at least the bindings helped. Like vim bindings, there seem to be Blender bindings that you can universally switch to in 3D modeling software :D

So, wham bam bam bam.. 2 months later.. I managed to model the thing
I've posted it on github --> https://github.com/Yadhu-S/Autocannon

Ya, it is ugly, bulky, and noisy when the cheapo motor spins, but it shoots.

Also, I used slider-crank instead of the scotch yoke to push the dart in. Why? because I wanted to have the "everything by myself" accomplishment.
Also because the calculation for it was very easy L+R = X & L-R = delta X. Pretty easy to solve.

So, I reinvented the wheel without looking at how they did in existing blasters, and you could say the wheel came out square. 

See the hole next to the battery. I had to carve that out using my soldering iron because I did not account for the distance of a screw that I had to use to seat the bearings...

I'll maybe make a few more posts describing how I made the auto-shut off for battery protection