My brother designed this housing 12/26/2023 for class use. You will need an H11 bulb and harness/connector to finish. He added a honeycomb interior finish for structural integrity (he's a professional CAD engineer for a global manufacturer).
This H11 bulb housing allows you to substitute an engineered load for inferentially assessing 12V circuit integrity without being blinded and burnt. Adding pass-thru banana leads to a cheap H11 harness will also allow you to measure voltage drop in the loaded circuit with convenience. While many others print a similar model, this is a file for free use IF you have printing resources. If not, buy one from a legit vendor.
The author marked this model as their own original creation.