X-Axis Rod Support for Wanhao Duplicator 4

A failing of the Duplicator4 is the long 5mm x-axis rods at the front and rear of the printer - they are too thin. There is constant inward tension on these from the belts and any bend in the rod is amplified resulting in jerky movement of the head assembly when you slide it by hand.
My device just about eliminates flexing of the rod by adding a support at the mid-point. It is designed for perspex cased Wanhao Duplicator4 but may well be applicable to similar build models. Distance from the centre of the rod to the case is 14mm both front and back.
These is some strain on the support so print it strong - I used 4 shells and 50% infill.

By moving the heads you will see the flexing of the rod, and attach the support (with contact adhesive or foam tape) when the up/down movement is in the middle. Once in place, add a drop of oil to reduce friction.

This has made a great difference to the feel of the head carriage on my printer, but there is still a slight bend in my rods which I'll only be able to cure by a full strip-down and replacement.

I have uploaded 2 variants of the support :
'Support short.stl' is for attaching with (industrial strength) foam tape - This is what I did, the tape being 1.5mm thick.
'Support Long.stl' is for attaching directly with contact adhesive and so is 1.5mm longer.