This is a remix of RCoutlaw's Eggfinder case. The main changes were the reorientation of the GPS module to point upward when the module is laying with its back on a table. Additionally, I added space for the audio module in the top of the case. Besides these changes, the assembly and wiring diagram are identical to RCoutlaw's model. I've attached RCoutlaw's description for the assembly along with a couple more fasteners that I used.

I used Onshape for this design and the model is public to make it easier to remix or adjust for personal needs. I'm so sorry that some of the sketches leave a lot to be desired with respect to organization. https://cad.onshape.com/documents/7b8094540d238a4594b6f309/w/b5ea68244b0247e86d68ccfb/e/48af75544180ec4d585d43c4

This case is for the Eggtimer Eggfinder LCD with internal GPS Module that's primarily used for retrieving/finding Rockets. This case was designed to use 18650 Li-Ion batteries, which can be charged via USB-C. Li-Po batteries can also be used, but Li-Ion have a higher capacity for the size and can be stored for longer periods without degradation. You can use any Li-Ion of any capacity that you wish (IE, the average current draw with the back light on is about 120 mA, so a 1500 mAh 18650 Li-Ion could get roughly 10+hrs per charge.) The plus side of using LiPo's is that you don't need the BMS, USB charging port, or the battery holder. You could also incorporate the USB-C charger as well but this will not balance charge the lipo which I highly suggest. You will have to determine what size lipo to use.

As with most 3D printed items and printers, there may be some fit and finish steps that will need to be done. I have tried my best to get this to where anyone can build it, but you may have to modify parts or find alternative solutions to a problem. If you need further assistance, you can message me on The Rocketry Forum https://www.rocketryforum.com/members/scott-c.32509/

Components used in this are as follows.

Eggtimer Eggfinder LCD

Eggtimer LCD GPS
[http://eggtimerrocketry.com/home/eggfinder-gps-tracking-system/](http://eggtimerrocketry.com/home/eggfinder-gps-tracking-system/)

Eggtimer LCD Audio Module

SS23E04 Double Toggle Switch 8 Pins

12mm Short Stroke Mini Waterproof Metal Push Button Switch

18650 Series Battery Holder

Multi-Cell 2S Type-C To 8.4V Step-Up Boost LiPo Polymer Li-Ion Charger

M3 plastic tapping screws for GPS and 18650 holder

M3 - 10mm and 6mm lengths 6mm for securing the back plate to the case and audio module and 10mm for the LCD module (not required, but adds a more polished look to the finished product)

2S 20A 7.4V 8.4V 18650 Lithium Battery Protection Board/BMS Board
[https://www.aliexpress.com/p/wishlist/shareReflux.html?groupId=26uHEzbLWBQ0UIXLHAoOaK%2FD3BBp5RHAtzaMw2jCi8U%3D](https://www.aliexpress.com/p/wishlist/shareReflux.html?groupId=26uHEzbLWBQ0UIXLHAoOaK%2FD3BBp5RHAtzaMw2jCi8U%3D)
M3 Nylon standoff kit
[https://a.co/d/136NWXH](https://a.co/d/136NWXH)

If the links don't work, search for the component to find the best deals. I purchased everything on AliExpress, but the links get changed fairly often.

Build notes: When soldering on the SMA, do that LAST so that it lines up with the hole. Solder one of the legs, then remove the board to finish the other connections.