I am working on a new extruder for my Da Vinci 1.0. based on the Budas extruder desing for 1.75mm. (my version). The two front fans blows air directly to the heat-sink but the third works as extractor fan, evacuating hot air from the chamber and taking it through an internal duct in the carriage to the printing area. This version is for a 15mm. linear bearings. The three sides clear covers(between the fans) give hi efficiency to air flow system. The direct drive is an adaptation from:jsirgado http://www.thingiverse.com/thing:783288 Updated 04/may/2015 8:50 pm. Change the desing of band grip to easy fit. Design change in the heatsink to increase efficiency . Updated 7/may/15 General improvements in design for a better presentation and performance. Added border to stop sensor in x axis. Resizing in the carriage to prevent snagging. Added printer brand for a more professional presentation. Improve the side covers.