As of late I’ve been having problems with bed adhesion and I finally figured out the issue! Thank God… So as some of you may remember, I recently put on the Chinese knock off E3D V6 hot end and when I first put it on, it was working great. Then kinda out of the blue, parts weren’t sticking. Corners were coming up and it acted like maybe my part cooling fan was on. Obviously it wasn’t because I can see the fan on the side… What… The hell… I tried everything I could think of but parts still weren’t sticking. Well I needed to change my filament because my roll was low and Just by chance I stuck my hand UNDER the hot end and noticed something. A lot of air was blowing straight down… Apparently the adapter I printed for this new hot end has some holes that blow air straight down onto the bed! How did I fix this? I simply turned my hot end fan around. Now it’s sucking air through the heatsink and blowing it straight out the back. Now parts are sticking great again! What a headache though. If you’re having adhesion issues, make sure you know where any air is blowing to.
Lol, the last problem I found with one of mine happened much the same way? But the problem? I put the fan on backwards!
@Kevin_Danger_Powers yep!
I may have had computers with heat issues and troubleshooting now includes checking which way the fans blow.
i am using a settings that the first layer are done without fan… maybe that helps too
@Ulrich_Baer I do that too. Best solution for me. The fans blow from the second layer and I also print the first layer five to ten degrees hotter than than the rest. More heat results in better adhesion.
everything is a tradeoff…
fine balance is very hard to achieve…
more cooling, faster printing…
if you have too powerful layer cooling (been there), bed cooling is a problem as you noticed…
higher bed temp, possibly damaged printing surface…
as silicone insulation for hotends minimised one problem, it amplified another…
now is anyone willing to spend x amount of your favorite currency, to have bed with multiple heating zones… to minimise this problem?
i have an “ich” for a long time…
bed with Peltier cells (TEG),
it would double as electronics/hotend cooling… and it would have ability to rapidly cool bed after print…
but serious implementation can become complicated.
@Ulrich_Baer I do that as well but it doesn’t matter if the part fan is already off. Lol. Oh well. Live and learn I guess.
seems i didn’t read this proper - sorry Ü, my hotend fan is so low power that it probably wouldn’t do anything if it is blowing on the hotbed. (~0,6W)