Have you ever had a job that only required one battery? This print lets you carry two Ryobi 18v ONE+ batteries snapped together so the terminals are protected, and they aren't just bouncing around separately in your tool bag. Should be good for air travel too, as long as your batteries are 5Ah or less - when I checked TSA (Sept 2025) they limit lithium-ion batteries to 99wh or less, and 5Ah@18v is 90wh. 6Ah@18v is 108wh.

Two versions included. Based on my limited testing (I only have 3 different batteries) V1 only works with genuine Ryobi battery packs, though some generics may fit too. V2 has a wider taper on the tube for the post on the battery - I have some generic packs where the post is slightly wider at the bottom, so it would jam or not fully insert into the v1 holder. Of course, genuine Ryobi batteries will fit in V2 as well. The clips and their location doesn't change between versions, only the tubes in the middle. I tried to make V2 use even less material as well by reducing the size of the "bridge" connecting the two tubes.

This is remixed from an old design I found on Thingiverse - https://www.thingiverse.com/thing:4014450 - so that it's smaller and uses a lot less material. Basically all I kept from that original design were the basic shape and location of the battery tubes and the side walls with the latches. Everything else is new.

I printed with 4 walls (0.4mm nozzle), 20% infill, and 4 top/bottom shells. Tree supports recommended, as normal supports fell apart leading up towards the top latches in my test print because they're so small. Also recommend using a more durable material like ABS or PETG since even PLA+ tends to warp when exposed to heat or the sun. PLA may be fine if your shop doesn't get too hot.