You know how deuterium expands alot when it faces heat? I used the fact that it does that and now ive gotten a self regulating fuel/heat system. Its really efficient too!		
				
			
					
	 
	
	
	
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ive added very compressed deuterium fuel, use it instead
		 
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Btw, copy and paste the deuterium into the deuterium!! This compresses the fuel and it lets run for a stupid amount of time, make sure to not do it too much or it will overheat!