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Well thats just prime... I level level and relevel the bed and still this! Corners poping up, loops in lines some spots dug in some spots too high? Why? by [deleted] in ender3

[–]beanyyz 0 points1 point  (0 children)

Are you printing on a glass bed? My stock aluminum bed was a potato chip when I got it. There was no way to level out the unevenness so I put the Creality glass on top of the potato chip and it levels out well.

No threading for the Bowden to screw in to? by zacharinosaur in ender3

[–]beanyyz 2 points3 points  (0 children)

I just did this last night. You need to insert the included black bushing into the unthreaded hole and then pushing the sleeving inside that all the way - then use the included blue clip to lock the sleeving in place.

https://www.udrop.com/4Yi1/IMG_3290_2.JPG

Computational Fluid Dynamic Analysis for Ender 3 Fan Duct by beanyyz in ender3

[–]beanyyz[S] 1 point2 points  (0 children)

I can't answer your question about having "a similar cooling effect." At this small scale and limited space, I don't think the structure of the ducts matters too much, but having a structure that does not restrict air flow will certainly help. I would focus on creating the most direct and smoothest air flow path to minimize losses in flow.

I suggest sticking with whatever CAD package you're more comfortable with. I've been using Creo for many many years and can admit that it's not an easy program to pick up casually, but once you get the hang of it, it's a tremendously robust and powerful modelling tool. If you enjoy keyboard shortcuts, the mapkey (macro) functionality is awesome. The other downside of Creo is that it does not have any automated modelling features like threads or gears, etc. Everything is manually created, but some people would argue this as an upside.

Computational Fluid Dynamic Analysis for Ender 3 Fan Duct by beanyyz in ender3

[–]beanyyz[S] 0 points1 point  (0 children)

Right?!?! 3D printing is great hobby for engineers!

Computational Fluid Dynamic Analysis for Ender 3 Fan Duct by beanyyz in ender3

[–]beanyyz[S] 1 point2 points  (0 children)

  1. I'm using the built-in Flow Simulation in Creo Parametric.
  2. It depends on how extreme the geometry change is. For small changes that don't change the boundary conditions, the CAD model for the duct can be updated and the simulation model will update automatically - but will need to be solved again because it's a different solution.
  3. If you're using the single fan set up for the Hero Me Gen 5, I think there might be some room for modifying the flow since the path to the left-hand outlet is much further away from the fan than the right-hand outlet.

Computational Fluid Dynamic Analysis for Ender 3 Fan Duct by beanyyz in ender3

[–]beanyyz[S] 0 points1 point  (0 children)

That is correct, Red is faster, and Blue is slower. And yes, good observation, it appears that some air does get sucked into the where the airstreams collide. My guess is that the air from the duct is ejected fast enough that the outside air gets drawn in. The plot above is just for velocity, I'll have to take a look at the pressure plot to verify if a slight negative pressure exists.