How should I dimension the vents that are supposed to do the part cooling just below the tip of the nozzle for a couple of 40mm blower fans? I have limited width in between the bearings of 9mm but can vary the other dimension. Right now I changed the ~9x3mm per vent to a more silent and maybe better off value of 9x8mm:
Vents closer to the tip, focused more on the tip, try not to have any airflow at the heater block and heater core. some insulation is really helpful on that, if you plan on a silicon boot you can have looser airflow.
Nice CAD work and design!
Looks very minimalist. Suggest maybe center of mass of the hotend assembly is better for rails than right at the tip though, for inertia balance and to make cleaning the tip much easier, will loose some build area though so I understand if that is a priority, cant see the frame so it’s just a suggestion based on less than complete information not any kind of criticism.
Here’s the whole thing: http://www.thingiverse.com/thing:1487375 also sketchfab model at https://skfb.ly/Uuv7 .
Regarding the vents, I had them initially more focused on the tip, closer to the tip but they were almost touching the heating block, opening of 3x9mm … kind of too focused right? Then I worked it out to a more reasonable 8x9mm asrea for the opening of each vent. Too large now?
No sock or other protection for now.
The best place from a less prone to errors machine is to have the tip of the nozzle right in the center of the plane that is defined by the XY rods centers …had a drawing somewhere… yeah, here: https://is.gd/Bjvktm . I don’t really want to get it lower than it is (it is quite a bit below the rods centers because of the bearings, plastic housing for the LM10UUs and then some more).
@AlohaMilton here’s a ~6x9mm mouth for the vents. Does this look better?
@Florian_Ford that looks about perfect!