Ultimaker Printhead

Ultimaker printhead with top-mounted fan.

I was inspired by Coyote69's lightweight printhead. I used that design for a few days until it warped during a long print. I tried several iterations and this one seems to work well. I've been using it for several weeks now. The weight reduction between the stock Ultimaker parts and the printed parts and fasteners is about 20 grams - so it's not great, but is a reasonable reduction. Most of the weight reduction is due to short screws instead of t