In general terms the present invention proposes a 3D printing apparatus 100 for printing a satellite component. The 3D printing apparatus comprises a housing 102, a seal 104 arranged movably inside the housing such that the seal partitions the housing into first and second chambers 106A, 106B that are fluidically isolated from each other, and a nozzle 108 in fluid connection with the second chamber 106B. The first chamber 106A comprises a gas having a pressure P.sub.1 and the second chamber 106B comprises a printing material. When the 3D printing apparatus 100 is exposed to an external environment having a pressure P.sub.2 being less than the pressure P.sub.1 of the gas in the first chamber 106A, the gas in the first chamber 106A exerts a force on the seal 104 which in turn exerts a force on the printing material thereby extruding the printing material out of the second chamber 106B through the nozzle 108 to print the satellite component.

Methods systems and apparatuses are disclosed for maintaining and controlling the temperature of a material adjoining a composite material in situ, while the composite material is being heating during a composite material repair.

Methods, systems, and apparatuses for repairing a composite material in situ are disclosed including maintaining and controlling the temperature of a material adjoining a composite material in situ, while the composite material is being heating during a composite material repair, such repair accomplished by positioning a heat source proximate to a first side of the composite material and positioning a thermoelectric device proximate to a structure located proximate to the second of the composite material, and substantially maintaining the temperature of the structure at a temperature that is different than a temperature of the composite material.

Methods systems and apparatuses are disclosed for maintaining and controlling the temperature of a material adjoining a composite material in situ, while the composite material is being heating during a composite material repair.