A cube for 4 lithophanes (93mm x93mm x2.5-3mm or 100mm x 100mm x 3-3.5/4mm) - a few other standard dimensions will follow soon)
Powered by electronics and a battery donated from a cheap powerbank. With this it can be used with the battery, or with a USB power supply (1A).
I will add pictures and detailed description next week. So this is more or less a placeholder with the STLs for now.

The Top_100mm and Bottom_100mm files are for lithophanes with 100mm edge length and 3-3.5mm thickness
The Top_100mm_4mm and Bottom_100mm_4mm have 4mm clearance for thicker lithophanes
The Top.stl and Bottom.stl are for 93mm edge length and 2.5-3mm thickness
The others are universal

Printing:

• Use the test-tool.stl to determine the correct width to print
• print Top and on-off-button upside-down - I will change this with the next export

non-printed components used:

LEDs:
4x SMD LED, Osram LCW JNSH.PC-BUCQ-5H7I-1 (no longer available), relevant specs:

• Package/Case: SMD-2
• Illumination Colour: Cool White
• Wavelength/Colour Temperature: 5000 K
• Luminous Intensity: 2590 mcd
• Viewing Angle: 120 deg
• Lens Colour/Style: Tinted, Diffused
• If - Forward Current: 20 mA
• Vf - Forward Voltage: 3.05 V

Powerbank:
https://www.amazon.com/2600mAh-Portable-External-Battery-Charger/dp/B00NIIR194/

USB-Breakout:
https://www.amazon.com/MonkeyJack-Female-Adapter-Converter-Breakout/dp/B071VZ2119

Resistors:
for the LEDs I used 4x 100Ohm 1/4W
the resistor values depend on the LEDs used. you can calculate them by subtracting the LEDs forward voltage (Vf) from the 5V USB voltage and devide it then by the forward current (If) in A. In my case:
5V(USB) - 3V(Vf) = 2V
2V / 0.02A = 100V/A = 100Ohm

Screws:
5x M2x5mm
4x 2x10mm pan head wood/universal screws