The matter condenser is made for making dark matter. If you unpower the block while it's "compressing" the obsidian, it will save the progress. However, if you take the obsidian out, it will reset the progress. Takes 30 minutes to fully go though one of it's recipes. You have to do that 4 times in all to be able to make the dark matter block.
Bug; 15w13a - 15w40a: When right clicked, you will crash.
Trivia[ | ]
Takes 30 minutes to make one dark matter piece.
Even if you unpower the block while it's "compressing" the obsidian, it will save the progress. However, if you take the obsidian out, it will reset the progress.