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The air pipe connection confuses me as well.. In one picture you have it connected to the carriage, in another its connected to the nozzle. Is the intent to eventually have the air hose connected to the carriage then another line from the carriage to the cone for easier removal?

Whats the difference between all the various cones? Height or?

I'm working on getting one of these K40's, its a huge price difference between one with the air assist and laser pointer and the ones without it, around $300 difference. So i was thinking of getting the cheaper unit and adding these parts myself for the same outcome.

I found some suitable cross pattern laser modules on ebay, so i would just have to design a holder for the laser to go on the carriage plate you designed and i would be off and running!