How much did this cost to build???
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laellee for 3-d files for a reasonable price. He has a very, very nice cannon setup. Printing costs will vary depending upon how much you are printing and if you have to use a service such as treatstock.com.
MoeSizzlac provided the cannon files. I would stress that reselling, recasting, or selling finished products from these files are a big no no. The files and market does not currently have a means to stop this outside of bans and black listing.
The servos you can get for 30 or so each. For servos you have to calculate inertia which is speed times weight and then calculate torque. Usually by stepping it over to newtons and then converting it to whatever measurement basis you are using (oz-in, kg-cm, ft-lb, etc...) I have been using hitch hs-645mg servos on mine with very few failures.
Hobby Town if you have a local store in your area carries servos. Some areas have a tower hobbies, but you are basically looking for a drone enthusiast or RC car enthusiast shop. They will carry servos you can use. I shop local when possible but have bought much from servocity.com and robotshop.com.
The mpg-6050 has been getting discontinued and is a little hard to get. Plus the libraries and hardware have some fundamental hardware and software library issues that are no longer being addressed. I have found if you do anything outside of his simple codebase things start refusing to work. Stick strictly to his setup and it works!
The bosch bno055 is another option and it is a bit more at about 40, but lowers processing overhead on the arduino. I am working on updating things and I am not happy with the slow input response on the wii nunchuck setup I am using and am switching over to a raspberry pi based setup.
The arduino is about 10 or so. That along with the bosch sensor can all be purchased on adafruit.com. I would strongly recommend purchasing as much as possible from there as they are US based and have a top notch support team.
avoid wish.com or banggood.com as I have had quality issues and anytime I buy from them I have to buy multiples as duds are not an unknown with them. I would advise on that same note that aliexpress.com and alibaba.com are ok resources for parts but only order once you are intimately familiar with what you need, want, and desire as some things can get lost in translation.
For budget, his budget setup is a 100 or less. Learning and breaking things and buying the wrong parts, factor in no more than 200. Space the purchases out over time and things are very affordable.