This is a remix of the original cooling system by thiagokunz, which is a must-have for anyone with the Prusa i3 from MakerFarm with the Magma hot end. The differences here from the original:
- Allowed slightly more fit tolerance between pieces
- Added retainer clip for wedge (back) piece
- Added bolt through-holes for easier removal
- Added the new fan cover as-is with a 90 degree rotation for printing
The main feature is the bolt through-holes, which allow you to remove the entire hot end with the cooling system attached (after removing the bolts holding the extruder in place).
This will definitely slightly reduce the airflow but should keep to the original design's intention of directing airflow away from the nozzle. The cooling fan for the all-metal Magma hot end is a must, but having air blow on it makes it much harder to reach temperature and interferes with the deposition of material.
Use this if you have a need for frequent changing of your extruder head (e.g. if you are swapping it for a CNC router or laser cutter head).
v14 (7 Oct 2013) - closed small gap in bolt hole shoulders on main duct shroud
10 Oct 2013 - Added fan cover (verbatim by thiagokunz, just rotated)
All three stl files can be printed on a 6" bed.
Use a fine resolution (0.2mm layer height or less) for best results. Infill shouldn't matter much but can be slightly denser than normal.
The main tray-shaped piece goes under the aluminum cooling block on the hot end. If you have accumulated a large blob of plastic due to leakage, this may prevent inserting it and you will need to heat up your hot end then remove it.
The wedge piece fits under the small guide clips and should stay in place while putting the extruder assembly back in place. The bolts should go through the bolt pockets. After securing the extruder you can mount the fan to the fan guide. The original M3 bolts won't be long enough - you can use #4-32 1.5" machine screws (available at Lowe's or Home Depot in the US). The fan and fan guide should mount to the extruder holes and you should feel air coming up from the small holes on the front.