This is a battery holder for 2 rows of pairs of 18650 cells (from recycled laptop batteries). It is used to create a parallel block for use in a small-ish DIY powerwall.
The "bus bar" slot will accept a 7mmx.5mm wide nickel strip OR a 6mm2 twisted copper cable (usually harvested from a main power cable).
Print two per block. I printed one in red and the other in black. So if you want a "24v" pack you'll need 14 of these in total.
The early design had a 1 layer skirt to reduce warping on my little Printrbot Jr (which has an unheated bed).
I've now added a version (v8c) with no skirt and enlarged it by 1% to make it easier to fit random cells in.
May 2018 additions:
- added 2x9, 2x12 and a 2x14 versions for those with larger 3D printers (I'm about to ugrade to a printer that can do 300mm wide.)
June 2018 additions:
- added the clip-on small voltmeter holder
- added the doodad for adding sockets at the bottom end
- added the DIN rail mount (only works with the 2x6 small blocks)
More details on that project: http://www.myonlinediary.com/index.php/Energy/PowerWall
This designed in Tinkercad: https://www.tinkercad.com/things/lft19zWDf7f and https://www.tinkercad.com/things/2KDykjNCrLk-18650-pairs-battery-holder-2x9-2x12-and-2x14-v9-no-skirt