This is a 28mm Archmage mini, remixed to enable an LED light in the staff. It's all pretty easy to print, but the assembly can take some work. A thin coin cell is inside the base, which powers the tiny LED. The case opens, allowing the battery to be replaced (or removed when not in use).
The battery you want is this one, which is exceptionally thin. You can find them on amazon, or even at the grocery store:
I will detail the assembly process, and all the additional components needed (such as the LED) below:
Step 1: Print the models
I modified the original Archmage mini with a 0.8mm hole down the shaft of the staff. I recommend printing him at 0.1mm.
The head of the staff (hollow cone) is printed with transparent PLA to allow the light to shine through. However if you don't have access to transparent PLA, the LED is probably bright enough to penetrate a thinly-printed standard white PLA, though I did not test this.
I designed the battery case to be printed separately from the mini, and glued on later. During assembly, you may find that the battery case is too small to comfortably fit the battery and wires, depending on how the wiring went for you. If that is the case, try the "bottomMoreSpace" battery case instead.
Step 2: Check the staff shaft
After printing, you should be able to slide a pin through the hole and out the bottom of the model, as shown.
Slide / push a pin through the hole in the model
Step 3: Prepare the battery case / base
I could have joined the battery case to the miniature model and printed as one piece. However, I wanted the battery case to be reusable in other LED models I have planned. So for now, this is a separate step.
Using a thumbtack, locate the point at which the staff meets the top of the base (top.stl), then push the thumbtack through, as shown.
Locate the point where the staff will rest on the base's top
Create a small hole with the thumbtack, then remove the tack
Step 4: Line up the staff and base
With the pin you used in step 2, align the base and the staff. You should be able to slip the base over the pin as it protrudes from the staff.
Once you are sure everything lines up, superglue the base to the mini.
OPTIONAL: You may want to prime your archmage prior to attaching it to the base. If you do so, leave the pin inserted! This will prevent paint from entering the hole and clogging it.
This is a good time to prime, as you do not want to prime the head of the staff later and ruin its transparency.
After everything dries, remove the pin.
Align the staff and the base
Step 5: Insert the LED
This is the LED you will need. It is tiny! There are a few LEDs shown here. You want the smallest one, which is 1mm in size:
Other vendors carry this LED as well, though I haven't seen them cheaper than this.
Thread the wires carefully through the staff, so that the LED sits at the top of the staff and the wires protrude from the base.
Press the wires to your coin cell for a test before going any further!
Step 6: Prepare the wires
You'll need to snip the wires so that they terminate at roughly the edge of the base, as shown. Discard the extra wire.
Then, untwist and separate the colors, as shown.
Once the wires are separated, you'll need to remove the insulation from their ends. Since these wires are so tiny, I found the best way to do this was to gently sand the ends with a medium sandpaper until you have a small patch of bare wire. I do not recommend wire strippers.
Snip the wires
Untwist the wires
Sand off the insulation on the ends of the wires
Step 7: Prepare battery contacts
Clip off the necks
Step 8: A teeny teeny bit of soldering
As soldering goes, it's really easy. I literally bought a $5 soldering iron on-sale for this.
First, lay the end of the bare wire on one of the tongues. Heat the iron, and hold it to the tongue for 30 seconds or so, then touch the solder to the wire at the point where it is contacting the tongue. You'll get a small drop of solder joining the wire to the tongue. That's it!
Step 9: Secure the wires
Put a small amount of superglue over the hole the wires emerge from. Smooth the glue flat before it dries, so that it doesn't take up too much space.
After the glue dries, curl the battery contacts so that they fit inside the base, as shown. Red is positive.
Step 10: Insert the battery
You should now be able to insert the battery. The positive side should contact the red wire. You can open and close the case freely. It should fit snugly, but not too tight. Twisting helps as needed.
If you find that it does not close, try using the alternate bottom provided, which has a little more space.
The mini should light up when the battery case is closed.
Battery and contacts should fit into the base
Step 11: Attach the staff head
Glue on the staff head. The LED will fit into the hollow space of the tiny printed cone. Be sparing with your glue.
Glue the staff head over the LED
Replace the battery!
Step 12: Paint as desired!
Be careful not to paint the staff head with anything opaque. When I made this, I used a blue glaze on the staff head to add some color. This is optional.
I'm happy to answer questions about this project if anyone is interested. More light up D&D miniatures designs are planned in the future. I'm hoping to incorporate an on/off switch in future versions. We'll see.
Fully painted, with "glaze" on the staff head