Hmm, a lot of that stuff doesn't apply to people who are making just orders for small parts (as in not pre-fabricating their own circuit board
) but I completely know what you mean Admin.
In my opinion it's always the small stuff that you don't bother to factor in, that adds up in the end. I mean it ended up costing me $25 for my custom-cut acrylic sheets, $8 for the chemical bond glue, and even things like purchasing a cheap "shopping cart wheel" caster, various bolts, etc. added up to unexpected costs. I think it's all about what you start with though. In my case, just about the only thing I had in advance was some Velcro adhesives, which were incredibly useful in securing my battery and my receiver, but if I didn't have any Velcro I probably would've bought some anyways.
So for someone like me I needed to buy EVERYTHING
If it wasn't for my uncle I wouldn't even have any threaded rods, nuts, or even a power drill
Yes, some families do not even own a drill
...I guess my dad was never much into DIY, which is funny because for work he built stuff at home for a while, just never needed a drill I guess
EDIT: One more thing I ought to mention, your excel file brought to mind an old quote: "Time is money". I think if you have one category filled out with something like 50 or even 100 hours spent on (in my case...this would be research...yah 100 hours
) and yet $0, you should consider if there's a faster way to do it, but you may need to spend some money on it. Now this does not apply universally, as somethings do need to have time spent on them, and no amount of money will make the process any quicker, but there is an interesting correlation between time and money, and perhaps in future projects this concept needs to be given closer scrutiny. This has some far-reaching implications, but I have to finish my robot project write-up for tomorrow
, so will not be able to expand on this idea tonight