Simple dual bowden Extruder for Prusa i3 rework
thingiverse
Update: --> Tested and working flawlessly, no issues with cooling and airflow. an update under works: light rig setup under the fan I had the following Design goals: -single fan, enhanced airflow duct to maximise cooling and reduce fan noise. -using common E3D extruder body and alu heatsink -Keep minimum distance between heads (now at 24mm), still need to work on parametric approach (which started with 40mm). -easy to disassemble (you know, jamming/cleaning and so on). Due to closeness of the heads, I could not have 2 clamps. -clamp with pass-through screws (no need for inset nuts). -structural rigidity -fanduct, supported with a dent intrusion behind extruders. -small part count (3) and printable (to be tested). -easy disassembly/assembly (tested). -BOM : 2/3 50mmxM3 screws. 3 M3 nuts Used few models for this: -derived from http://www.thingiverse.com/thing:547706 but as source was in Solidworks, created openscad version. -Parametric fan blade http://www.thingiverse.com/thing:689564 -E3D extruder http://www.thingiverse.com/thing:433258 Disclaimer: I have printed couple iterations, this has been improved: -M4 nut insets -Fanduct support (simplified, with just dent on back seems good enough) -Extruder separation -Increased length and diameter for larger extruder Now with pictures ! Instructions with some patience and few hours of openscad, printing, etc
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