3D printers are impractical for household repairs but I really think 3d pens like the 3Doodler are missing an opportunity here. I bought one with the original Kickstarter and we played with it for a while before putting it back in it&#x27;s box and forgetting about it.  A couple months ago I came across it and decided to try and fix the broken castor on a dehumidifier.  The part was way to complex to be worth modeling in CAD for the amount of inconvenience it presented but it was ridiculously easy to weld the old part back together and reinforce it with the 3Doodler.  Since then I&#x27;ve been using it in conjunction with an old soldering iron to fix things that I just don&#x27;t trust glue to hold.