AY-AT DIY KIT (GM328B) multimeter.
Big box printed in 3D:
https://www.thingiverse.com/thing:2070417ISP Connector.
3.7V Lithium battery for a photo camera (recycled).
Charger module + power supply (9.2v).
LC filter (not necessary, but I like well filtered voltages).
Low battery led made with a KA75330.
LDO HT7550 changed by an MCP1702 5v.
Reference voltage TL431 changed by an LM4040 2.5v.
Battery cutout switch.
Zener measurement up to 45v with DC-DC Step-UP manual switch.
TVS protection for external voltage.
Filter capacitors for the power lines of the processor and the reset.
Socket ZIF supplemented.
Copper sticker for discharge of capacitors (used in glassworks).
Rubber stickers for the base (used as insulation in windows).
Stickers for serigraphs printed on inkjet printer and improved with spray varnish.