This launch ignition box is for model rockets. It prints assembled and in place with no supports. For use with one 9v battery. The case has a freely moving switch cover to protect from accidental discharge. The case has a sliding panel to ease access and change out the battery.
You will need a 9v battery, momentary switch (normally open), 9v battery clip, and a length of bell wire (or similar). The hole for the momentary switch is 7mm in diameter. Modify or drill out to accommodate for larger/smaller switch you may purchase. All parts, except the battery, should run you less than a couple dollars.

Print with 0.3mm thickness or less. I used 0.3mm and it printed fine. Print with an infill between 15% and 25%.
The slide cover location of the main file has integrated supports so remove them prior to installing the slide cover. Installing the switch is a little tricky, but be sure to wire everything first.
ALWAYS LAUNCH MODEL ROCKETS IN A SAFE AND OPEN AREA.
HAVE FUN.