A friend of mine needed to electrify his acoustic guitars so he bought some pickups. He also needed a way to support them in the sound hole, so he asked me to make him some of these holders.
You need to print two of them per pickup, so that one goes otside and one goes inside the sound hole. Plus You'll have to drill two small holes for the small mounting screw.
Hope you find it useful.
Model is 2mm tall and I usually print a 1mm initial and final layer, so infill is 100%.
Originally it was designed to accomodate a 18x69mm pickup, but I had to scale it up a bit since the first print was too tight, so you may have to adjust it as well.
I didn't bother measuring and designing the holes, as it is much easier to mark them and drill them afterwards.