18v Makita Battery to Ozito/Einhell Tool Adapter

thingiverse

This adapter lets you use 18v Makita batteries with 18v Ozito/Einhell tools. The fit is snug but not overly tight, preventing the adapter from shifting around within the tool or battery while also avoiding any binding issues. To complete this print, you'll need some 1mm thick copper sheet - I flattened a copper pipe that had 1.2mm thick walls, and after flattening, it measured about 0.9mm. You will then need to solder the copper together as seen in the photos. I've included a sketch of the shapes you need to make. Make two of each shape per adapter. The 21mm length is the one that gets bent to receive the tool contacts. The cheapest way to cut copper sheet may be with a pair of tin snips. This print likely needs to be made in something more flexible than PLA. I printed it in ABS, but PETG should also be suitable. I've included two versions: a one-piece version and a 2-piece version. The 2-piece version requires less support material but does need to be glued. I prefer the one-piece version. Thanks to whity and sportssedan for their original designs. Whity's Makita adapter is fantastic, but it was too tight to fit, so I've adjusted it and added some holes for the contacts. I took inspiration from sportssedan's Ozito adapter design, especially the latch, but made it more flexible and larger overall for ease of use and positive locking. As a side note, I discovered that aluminum is very hard to solder and had to switch to copper, which was much easier to work with. You can find 1mm copper sheet online, or you can split a copper pipe and flatten it out if you have trouble sourcing a copper sheet. Edit 28/04/2020: I made the catch slightly taller and printed in PLA. Can confirm that PLA works fine.