Grégoire Saunier

Bear secret extruder cover

Added 2019-01-18 09:30:53 +0000 UTC

Hey guys, I am working on a "secret cover" that create a negative pressure on the output of the v6 heatsink. I have attached the STL for those of you that wants to try it.

In my tests I got a clear cooling improvement but vertigo from Discord reported zero improvement (its room temp is really low). Another guy (klmx on Discord) helped me with CFD simulations and I am still trying to understand the images. For now I can see the negative pressure but not sure how to read velocity yet.

On the print side, I could see improvements in small parts that require retraction and a bit better tip. However, my test prints are no very reliable for now, I was mainly working on testing the cooling.

Here you can find my test case if you like to run it : https://github.com/gregsaun/bear_extruder_and_x_axis/tree/master/test/hotend_cooling .

The test is composed of a gcode and a python script to read output logs from Octoprint. Here is what the gcode is doing :
1. Move to an adequate position
2. Heat the hotend to 280°C and bed to 50°C
3. Wait 10 minutes
4. Start cooling down the hotend
5. Report every minutes the hotend temperature (9 minutes)
6. Wait until hotend reach 50°C and report total time

You have to activate the serial logs in Octoprint. Then you can use the python script to parse the logs.

Tests done with the Sunon fan.

Enjoy :-)