New circular print fan duct available



  • I thought some people here might be interested in the new circular fan duct for the Delta Smart Effector I've just published on Thingiverse:

    https://www.thingiverse.com/thing:2808152

    This fan duct mounts in the same way as dc42's fan duct (in fact, it uses a minor variant of his EffectorFanBracket design), but it provides a circular (360-degree) or semi-circular (180- or 270-degree, or any other value over 180 degrees if you edit the .scad file) output vent. This improves cooling noticeably, but not dramatically, compared to dc42's design.


  • administrators

    Thanks, I'll try it!



  • Im using this on both of my smart effectors now and I really like it. Well done!



  • @Threephourths:

    Im using this on both of my smart effectors now and I really like it. Well done!

    Thanks! I'm glad you like it!



  • What version is everyone using? 270 deg?



  • Im using the 270 currently. Out of curiosity, how close to the print bed should the shroud come? Mine seems to sit pretty high. Anyone have a pic of their setup?



  • Mine is about 5mm above the tip of the nozzle. (This is using a genuine E3D V6 but with a third-party stainless steel nozzle.) This height is dictated largely by the bracket and fan, and should be similar to the height of dc42's fan duct. Note that the airflow is aimed to converge at the center of the torus at 8mm below the duct – in other words, 3mm below the print surface, in a theoretical sense. In practice, of course, the air stream is not a mathematical line; it has a diameter, there's turbulence, etc. I'm not an expert on airflow by any means, so I was just guesstimating at something that would produce good airflow in the area immediately surrounding the tip of the nozzle, without directing much airflow on the nozzle or heater block – I didn't want to cause problems keeping the hot end up to temperature.

    If you care to experiment, of course, you can adjust the targetZ variable in EffectorCircularFanDuct.scad file, or adjust EffectorFanBracket.scad to lower the fan and duct. Either will require you use OpenSCAD and build a new .stl file. You could also look at https://www.thingiverse.com/thing:2573606, which is a modified bracket for the E3D Volcano. Somebody's already tried that combination and said it works, but I don't have an E3D Volcano for testing, myself. My guess is it would lower the fan duct too low on an E3D V6 or most clones.



  • Mine seems to sit a little bit higher than 5mm above the tip. Im using the bracket you provided and all original E3D parts (nozzle, heatbreak and block and sock). Weird. On my previous print fan (DC's model) I had to modify the bracket and make it extend a bit lower to get proper cooling. Perhaps I should use my modified bracket with your duct



  • I made a version of the bracket with a slot replacing the hole - you can then fine tune the height easily. I made the duct with 3.9mm holes and used m3 brass inserts, for easy fitting /adjusting. Great design



  • Any chance you could share that bracket Adrian52?



  • I "modified" mine by adding .5mm spacers between the bracket and PCB.

    Adrian52, I tried your fan duct but found that the sock on the block got in the way and impeaded cooling. I liked that design too even though it didnt work for me.

    The Tusk coolers seem pretty interesting as well



  • Hi benkay
    the slotted bracket is on thingiverse with my first attempt at a duct - 2521716



  • Nice designs, i would like to use a 50mm radial fan with a circular duct and may create a remix of srs5694's design for that.

    Any idea how far away the fan duct should be from the heat block depending on the heat resistance of the material? Is the silicon sock enough to shield a pla/petg/nylon duct when getting very close to the sock?

    Ideally the duct could reach below the heat block as with metall tubes for i.e. the berd air system: https://www.thingiverse.com/thing:2638144
    Probably not possible with plastics other than possibly polycarbonate?



  • @Nuvag:

    Nice designs, i would like to use a 50mm radial fan with a circular duct and may create a remix of srs5694's design for that.

    I toyed with doing that. In fact, my design is based on an earlier effector-and-fan design that I did, which used a 50mm radial fan, before I got fed up with the inductive probe I was using and decided the Smart Effector looked like the best way to do bed probing on a delta printer. Although I've abandoned that effector design for myself, I'm planning to publish it, probably this evening (US Eastern time). You might be able to merge bits from the two designs once I publish the effector.

    That said, one reason I didn't pursue the radial fan idea is that placement of the fan seemed awkward. It would either need to lie on its side or be placed upright but extend out quite a way from the effector, with a rectangular duct to link it and the circular duct. It didn't seem worth the effort to me personally to design it – but of course if that's the design you prefer, and if my design helps you get there, then that's great!

    Any idea how far away the fan duct should be from the heat block depending on the heat resistance of the material? Is the silicon sock enough to shield a pla/petg/nylon duct when getting very close to the sock?

    I don't know for sure, but I can say that I printed my duct in PETG, and it seems to be holding up fine to printing PETG. (I've got an E3D V6 sock on my heat block.) My other printer (a Robo 3D R1+) has a PLA fan duct that's about as close to its nozzle as my fan duct design design gets to its nozzle, and even the Robo's fan duct seems OK. (It looks like it's softened a little, but not much.) I print PETG on that printer, too, so the heat block gets up to 250C or thereabouts.


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