AAA/LR03 to AA/LR06 Battery Adapter (saschda's)

Utilize AAA/LR03 micro-batteries in devices designed for AA/LR06 cells. This is feasible provided the device's power draw remains modest. I employ this adapter to exhaust my numerous depleted AAA batteries in AA-compatible devices.

Inspired by "Jogi's Battery Adapter" (https://makerworld.com/de/models/685717)

AAA Dimensions: 10.5 mm diameter x 44.5 mm length.
AA Dimensions: 14.5 mm diameter x 50.5 mm length.

Length differential between AAA and AA: 44.5 mm versus 50.5 mm. To bridge the 6 mm gap, a screw approximately 6 mm in length (*including* head!) with an M2.5 or M3 thread is required. Screws of these dimensions are not readily available, but suitable options can often be found amongst PC screws.

Furthermore, the screw must not be painted, otherwise, it will (naturally) not conduct electricity. For enhanced conductivity, slightly sanding the screw's ends is beneficial. Pointed screws are not recommended, and any head type may be used, though I would avoid countersunk screws.

A difference from "Jogi's Battery Adapter," besides the obvious design variance, is the utilization of a smaller screw hole to prevent the screw from falling out. A secure fit feels superior. Regarding battery fit, I strived for a snug configuration. However, significant variations exist between manufacturers; some batteries remain slightly loose due to minor thickness discrepancies.

The screw can be easily inserted from the outside with minimal force; it self-taps its own thread. The screw serves as the positive terminal, typically contacting battery holders directly; the negative terminal utilizes a contact spring. The positive terminal is also marked with two "+" (plus) symbols on the model.

These dimensions account for PLA shrinkage; testing involved Bambu Basic and Silk+. Print the model with the closed side (positive terminal) facing downwards.