LED block

I designed this battery and LED block for use in other projects.  The first one I used it in is my soprano ukulele with LED lighting.

The block holds 2 AA batteries, a switch, and up to 24, 5 LEDs.

The video below provides visual instructions on building the battery block.  A small amount of soldering is required.

Print Settings

• Printer brand: Bambu Lab
• Printer: P1S
• Rafts: No
• Brim : No
• Supports: None of the parts require supports, except for the battery block
• Resolution: 0.12 mm
• Wall loops : 2
• Infill: 15% 
• Filament : Sunlu Transparent PLA

In addition to the 3D printed parts, you need

• Battery holder for 2 AA batteries with switch.  I use the one from Evan Designs
•  5mm LEDs. I got the Bojack 5mm LED kit for a variety of colors.  Similar LEDs are available from Digikey.

It's important to use LEDs that require 3V or less, since that's what 2 AA batteries supply.  

The LEDs are soldered together.  The long lead is the positive (anode). When connecting LEDs always solder the long lead of the lead to the long lead of the other LED, and likewise solder the short to short leads.  This connects the LEDs in parallel, so that the all get the same voltage.  Then when connecting the LEDs to the batteries, the red lead (positive) gets soldered to the long lead.

In the Bojack kit, the green, blue and white LEDs require 3 V, so nothing else is needed to use them other than the Evans Designs battery holder and switch.

The red and yellow LEDs require 2 to 2.2 V.  To use these LEDs an additional 50 ohm resistor needs to be added in between the batter holder lead and the LED.

In addition the green, blue, and white LEDs in the Bojack kit are the brightest.  So I tend to use those, rather than the red or yellow.

The battery block is the only part where I use supports.