Looking at getting some small parts machined using Brass.

[m_c]

Couple suggestions regarding the design.

Does the battery block need all the rounded corners, and does the chamfer have to be flat?
The reason being the number of tools/positioning that would be needed.
The vertical rounded corners can be done easily with an endmill, at the same time as the holes are drilled for the threads.
However the rounded corners on the top, will either need a rounded edge cutter (probably not the proper name, but not a common cutter regardless).
The chamfer will either need a chamfer cutter (more common than the above cutter, but still not common placE), or for the part to be repositioned at an angle.
For the chamfer and top rounded corners, if you don't require them smooth, then they could be profile cut with a ball nose cutter which would result in a stepped finish. If needed the steps could be sanded/polished out after, but doing it that way would loose some accuracy.

The chassis insert looks easy enough, other than would need flipped to get both sides machined.

[Jonathan]

I doubt the accuracy is that important. I think these are just weights you put in an RC car to compensate for the low mass of LiPo batteries. Brass is not much more dense than steel, so you could use steel...perhaps stainless. That does loose the eye candy which is the main selling feature on most model car parts.
I've not used them - I prefer to just fill every available space with batteries for more power :naughty:

[ryanlownie]

I could remove the rounded edges off the parts no problem, they are purely aesthetic. What I've done with those parts is simply take the original plastic part and replicate it, the design could be simplified no problem.

The reason for brass is as Jonathan highlights, the eye candy factor... Steel weights are starting to pop up but they simply lack any style or bling factor.

I will revise the designs tonight for simplicity, if anyone would like the files please let me know. Maybe someone with a bit of brass knocking about could machine one for me to try? Paid of course.

[Jonathan]

The other option to save money on materials is to sand cast them. Then machine or just buff them ... You can cast with scrap brass, like plumbing fittings.