I took and old game box, and we had a few lying around. The first one I left the paper one and did it in paper, then tape to make water resistant- I've got kids, and I need protection for my precious AC amiibos! So I figure it isn't the best, but would work to prevent moisture should it get near my stuff without my permission. =) I used paper, and a large print. This is unadvised as you can see the box underneath and it doesn't look as good as the infinite pattern- which hides your lines and mistakes. The slight overwrap on this that I did for the sides, then placed the last sheet on top is the best.
The second time I went with a smaller print, cardstock paper, and tape. Looks like plastic, but I did have to cut tiny slits on the top to help breathe the box when closing cause other wise the air bubble pressure pushes back and takes forever to close the stupid box. I did cut the side to the exact length on this one, not as good as the first one where I did a slight over wrap then placed the top sheet to hide seems. This pattern works the best for light colored prints.
The other box I did I used a busy pattern. I wanted a place for my non-AC amiibos, and decided that I liked the Splatoon pattern. Worth a shot and I love Splatoon, so a win-win for me. This was really my second box. I wanted to mess around with pattern on this go. Looked better. I used an infinite pattern and printed on paper. Honestly, the paper worked better than the cardstock, if it is dark enough not to show the box underneath. I stripped the paper off of this before placing my own. It is a larger box (old scrapbook paper holding box). I like this shape better as you can get several in one box. I left the bottom undone because I think it compliments it better and the lid goes on and off better because it doesn't go all the way down the side. I used regular paper and lined up four sheets starting with a center point on the top then wrapped it down and over the sides. This is great because the pattern lends itself to that and looks pro. So this version works best.
I will eventually redo them in a heavier cardboard box, with layers so that they can stack in one box, be protected, but be in the same place. But for now this works.
I also created "hashtags" as people are calling them now. Frankly, they are still number signs, or pound signs, or octothorpe as I first learned them. These were made from a smaller thinner cardboard. I measured and divided the spaces as I needed them. You cut every so small "v" coming to a stop in the middle. Do this on both the vertical and horizontal. Don't make the "v" to big or it won't hold. Start with just a straight cut at your line, then take a sliver on either side meeting up at the stop point. Then assemble!
I also lined each box with a bit of scrap fleece. So soft and fluffy that my amiibos will certainly be happy! In my larger box I used scrap batting from my quilting. I like fleece better. Just seems to be better.
Before I close the box I will also be putting in cubes of soft foam. I have seen pinterest things where you could make a custom molded foam pad by wrapping your amiibo placing it down then use spray foam to create a dense usable foam section made for your amiibo. But that seems like a ton of extra work when I have a spare piece of 3 inch foam I can cut down in a fraction of the time. It's about using what you have on hand peeps!
So the lessons learned if you should attempt is:
Use darker prints with an infinite pattern- it'll make your seems invisible
If wrapping sides and placing top piece use regular paper and do a slight overwrap before placing top sheet. Otherwise lining up infinite pattern in smaller sections that cover work really well.
Wrapping in tape helps, but taking the time to modpodge the sheets down and give a protective layer would be better. It would also help with any sticking issues or pressure issues when opening or closing of the box you get when using tape. But you should protect it somehow because then a drop can be dried before ruining electronics!
I hope all goes well with your adventure with custom amiibo storage. I hope my experimenting can save you time and money. I also recommend looking up on pinterest other box forms. Additional tutorials can prove useful. I thought about using a plastic base and covering it with fabric, but then where do I get Splatoon and Animal Crossing fabric?!