After perusing the web for a modular and good looking 18650 holder for an EV project I decided to learn Solidworks and build my own. I run my filament a little hotter than is recommended for ABS but it seems to make the layers stick together better (with the help of a cheap enclosure build). I will upload pictures soon to update the project as well as add another "Thing" to hold these Modular-Mags. The whole point of this project is to make the batteries easier to hot swap since the batteries are not welded or soldered to the connection lanes. Along with this the "mags" will be able to be hot swapped from the main battery holder.
I used blue for negative, red for positive, and black for the connecting pieces.
I used brass strips (.016" x 1/4" x 36") from Amazon to connect the batteries and zinc (#8-32) machine screws (1/2") and nuts from Home Depot. The parts friction fit on the top but I used M2.5 x 10mm for the bottom along with M2.5 hex nuts. Since I don't use a BMS on the battery I simply added wires to the bottom of each screw nut to regulate the voltage of the cell.
Requires 2 #8-32 screws, 4 #8-32 nuts, 2 M2.5 nut and bolt, along with a length of brass strip. I used a soldering iron to attach the brass and zinc.
-The middle of the holders tend to not always touch all the batteries and the easiest
fix is to us a zip tie that fits in the grooves.
-The nuts on the bottom connector are a snug fit but very doable.
As with any project pertaining to 18650 batteries I do not take responsibility for damage or harm that occurs. Be safe and Enjoy!
Hobby King Generic ABS*
*ABS is recommended as it is more durable and can withstand more heat.
I print at 245C for the extruder and 110C for the plate.