a simple rail cover that goes on the left of the x axis on ender 3 v3 se
see the rail conversion here: https://www.printables.com/model/808073-ender-3-v3-se-x-linear-rail
see the onshape document here: https://cad.onshape.com/documents/4f4a3b11fe2e66fa94c41770/w/c897e8e10cfc3847b5548ec5/e/052c3e8eba19be180d658b2c
The author remixed this model.
removed few parts from the original model, since the original doesn't fit