Some LED collars have ridiculously flimsy locks, which break after a month or two. It's a shame when a fine rechargable collar becomes unusable because of such a small detail.

This is an ad-hoc solution based on the original design. 

The item was designed in Compass HOME edition, which is not supported by Printables. However, if you are interested, I can provide the original file on request in native Compass format.

I print with PETG. ABS should be fine as well. PLA won't work - too fragile.