The file '3x AA To D Battery Adapter (no Soldering Required) 3D Printer Model' is (fcstd,stl) file type, size is 27.5KB.
You will need two of these per one D battery.
I used household aluminium foil to provide contact - you will need to make it slightly different on each end. Just look at D battery to get idea how to form foil to provide reliable contact.
aa2d.fcstd | 11.9KB | |
aa_to_d.stl | 63.7KB |