Hidden Deck Fastener for decking with grooved sides.
(based on measurements taken from Trex hidden deck fastener)

I used screws that came with the original fasteners. You would need to find some narrow headed screws, or modify to provide a deeper countersink for a regular sized screw.

These are used on a south facing, unshaded deck and have stood up when using PETG. Would likely melt if done with PLA.

Creality

Ender 3

No

No

.20

30