BoM...

[MrForbes]

Raw material might be a 10 foot piece of 1/2" diameter 1/16" thick round aluminum tubing.

[Tiix]

So something you need to cut or alter correct?

[MrForbes]

Yeah, it could be....but again don't get too caught up in the wording, you basically just need to list all the parts and materials you bought and used on the robot. Sometimes there's just a part number and the name of the company that made it, and the price and quantity. Other items will be made of raw material, and won't have a part number. Do the best you can with the information you have, and be as complete as possible.

[Elgin Clock]

Be careful to watch your overall total, but don't go too crazy.

We helped some teams write their BOM in Maryland a few years back, and because they had so much to spare budget wise, we just put the full price of a sheet of Lexan (at 300 dollars a sheet) when they only used a piece that was 12 in. x 12 in. and they still came in way under budget.

Bottom line is when making your BOM, make sure you list everything you used, and the price, but you probably don't need to account for every single penny as long as you're approximately there.

Just be sure to be fair with the pricing.

For example, if you don't know how much that box of screws cost (even if they were really only 2 dollars a box) throw it in as 5 dollars.

Better to over estimate, and be off a bit, than to say your robot only cost you 200 dollars total to make because you underestimated prices by a lot.