Other Parts available here:
Top Hemishpere - https://www.shapeways.com/model/302594/thermal-detonator-top-hemisphere.html?li=my-models&materialId=6
Bottom hemisphere - https://www.shapeways.com/model/302596/thermal-detonator-bottom-hemisphere.html?li=my-models&materialId=86
Middle Ring - https://www.shapeways.com/model/302595/thermal-detonator-middle-ring.html?li=my-models&materialId=86