A battery box to allow the wiring of NIMH AAA batteries to make 12 volts (10 batteries). While Lithium Ion has a higher energy density, NIMH has several nice properties such as being safer and not being damaged by draining completely. The two pieces should slide together with some friction and may require a slight sanding. I increased the clearance by 0.004" from when I printed as it was a little tight for me. I also increased the length of the dividers to make the batteries stay more straight. Parts are as follows:

Terminals:
https://www.amazon.com/gp/product/B072379C1R/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=3dprinting456-20&creative=9325&linkCode=as2&creativeASIN=B072379C1R&linkId=8b49a41cf4e53761c3aaddc09ede232a

Example of batteries that could be used:
https://www.amazon.com/gp/product/B07L8FZZMT/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=3dprinting456-20&creative=9325&linkCode=as2&creativeASIN=B07L8FZZMT&linkId=e925c6fda898acadfe0a70bf23fc75dc

DC connector:
https://www.amazon.com/gp/product/B06Y4YXRMC/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=3dprinting456-20&creative=9325&linkCode=as2&creativeASIN=B06Y4YXRMC&linkId=1845c0a1fedd5d754eb1244d74b1a5ba

-solar tabbing wire to connect terminals
-28 awg or better wire to connect to dc connector

Charger similar to what I used:
https://www.amazon.com/gp/product/B07RW73G45/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=3dprinting456-20&creative=9325&linkCode=as2&creativeASIN=B07RW73G45&linkId=11b637676b85c0908c891a5796d3cde9

I have included amazon links as these parts will ship quickly, however, if you are willing to wait (as I was), then you can get these parts for a fraction of the price on ebay or aliexpress. I used a charger from a 12 volt nimh rechargeable drill that I had around.

Anet

A8

No

No

0.28mm

35%