This is version 2 of my sprinkler head protector, this time built with FreeCAD (included) and parameterized via a spreadsheet within the FreeCAD design.

I've also exported three STLs with a 75mm inner diameter and lengths of 40, 60 & 80mm. 75mm is wide enough for all of my sprinkler heads.

Here is my Version 1 (https://www.thingiverse.com/thing:4842758) created with OpenSCAD.

I needed a deeper one and wanted to build it with FreeCAD. With this version, the spikes integrate with the shell much better.

Creality

Ender-5 Plus

Doesn't Matter

No

I print this in PETG with high resolution and infill. Being the protector is hammered into the ground, it may not matter much what kind of filament is used.