Valve indexing caps for car tyres, v.4

Updated to version v4.1: 

Reported that overhang (and other possible print material remains) inside the caps' hole may deflate a tire, therefore:

• The caps height increased by 2 mm. 
• The caps inside hole end is modified to conical shape, instead of flat, to remove possible overhang. 

What to do with those already printed caps? Just need to inspect the cap hole bottom. It mus be clean and quite flat, without print residue as a result of print overhang. 

Version v3: 

• added caps thread, which is the same as automotive tyre valv: .305-32 TPI (dia 7,747 x 0,7938 mm pitch).
• better sealing against the valve body.

You need this, when it is time to change wheel with summer to winter tyres or vice versa.

 I had a set of Tyre Valve Caps for wheel placement, prior to wheel/tyre change (winter - summer) but signs were printed and not enough visible. The original does fit loose on tyre's valves and came off very easy.
I have googled around to see if there is something better. I did not find anything good enough and I decided to design my own caps, which are much better visible (the symbols have a texture and are 3D printed in two different colours). The colour change is generated in the gcode. I suggest to print all of them together with brim. Together, to skip 8 times change filament colour instead of two times. 

No need for support material. If you can't perform colour change, you can paint arrow and its square with nail lacquer.

The caps are now with appropriate thread (Schrader valve size). The caps do fit nicely on the tyre's valve and do not come loose. It is easy to screw and unscrew them. Now we have sealing between the cap and the valve body. The sealing is tested and does not allow water to come in. I am sure you won't be disappointed.