So here yet another anti Z wobble thingy. But this one is made for your Geeetech I3 and it look nice !
Put your lead screw in there and free your X axis from those horrible bent rod and squishy bearings.
Made with love in Blender.
I would advise reducing extrusion width to 0.38mm, otherwise you may get artefacts near screw hole edges, however the part will still do it's job.