Ex vacuo atom chips, used in conjunction with a custom thin walled vacuumchamber, have enabled the rapid replacement of atom chips for magneticallytrapped cold atom experiments. Atoms were trapped in $>2$ kHz magnetic trapscreated using high power atom chips. The thin walled vacuum chamber allowed theatoms to be trapped $\lesssim1$ mm from the atom chip conductors which werelocated outside of the vacuum system. Placing the atom chip outside of thevacuum simplified the electrical connections and improved thermal management.Using a multi-lead Z-wire chip design, a Bose-Einstein condensate was producedwith an external atom chip. Vacuum and optical conditions were maintained whilereplacing the Z-wire chip with a newly designed cross-wire chip. The atom chipswere exchanged and an initial magnetic trap was achieved in less than threehours.
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