Physically they may look the same but if you want an actual Cat 6 cable it's very unlikely you are making it yourself.
The tolerances for Cat 5e, in terms of amount of un twisted cable you could have in the plug, were tight already. Cat 6 and you don't really stand a chance.
You certainly can't make one with existing Cat 5e tools.
However it is worth noting that unless you are planning on pushing 10G ethernet over them ( up to 40M ) then you might as well use a Cat 5e cable.
Edit: Also I seem to remember when we kitted out a new data centre there is a recommended minimum total length of 15m which is mentioned here.
Also from the above
Category 6 Patch Cord Questions
Will contractors be able to make their own patch cords?
Category 6 patch cords are precision products, just like the cables and the connectors.
They are best manufactured and tested in a controlled environment to ensure consistent,
reliable performance. This will ensure interoperability and backward compatibility. All
this supports patch cords as a factory-assembled product rather than a field-assembled