LED retainer

This is a retainer (holder) for COB LED chips. The current model is for 26mm wafers but it can be customized to any size. The retainer fixes the wafer to the steel plate inside the armature so that it can act as a heat sink.
I printed a bunch of these to fix a broken fluorescent light in my workshop. Since these LEDs are very cheap and can be directly hooked up to AC mains voltage (230V) they are well suited for this kind of application. Four LEDs, rated 7W, provide more light than the 36W TL