Secures LEDs against being pushed back in to the mount, since it features little latches. Fits in an 11.5mm hole with at least 1.5mm material thickness
Printing is best be done with a 0.4nozzle and layerhights from 0.12-0.2mm. No support needed. PLA worked just fine with me but since the holder features little latches and has to be snaped in place, PETG might be more suitable for this job. Should also work with resin
If you have to modify the led mount to make it fit, you'll find the .step for download too
You'll find the 3mm LED Mount version here, the 5mm version here and the 10mm LED Mount version here

The author remixed this model.
It is changed in order to work with 8mm LEDs