CME 0 Posted December 12, 2016 in Trying to install UM2 Hotend but print cooling fans won't turn on Hi everyone. I've owned the UMO+ for a couple months now, and recently I was able to get an UM2 hotend (the makerspace I'm part of upgraded their UM2). I found Neotko's wonderful guide on how to install it, and decided to test the heater, fans, and thermistor without installing it yet. I plugged everything in, and the heater, thermistor, and the hotend fan (the small one) work great. However, the two print cooling fans act strangely. I can increase the led brightness from the ulticontroller and it turns the fan plugged into the LED PWM port on, but when I turn the fan up to 255 on the ulticontroller, it does not even move. When I only plug a fan into the FAN PWM port, it works. I think this is a firmware issue. I'm using Amadee's firmware builder, but am not very experienced with it. Can someone tell me the settings I should use. If it helps, I have the 2.1.4 board. Thanks! Share this post Link to post Share on other sites
neotko 1,355 Posted December 12, 2016 in Trying to install UM2 Hotend but print cooling fans won't turn on Umm Um2 fans don't start to move until 70-90/255 they work with an option called Fan minimum PWM (set it at 80 on the @Amedee builder) and also use Fan PWM kickstart. 300 millisecs or more works. Try this adjustments and build a new firmware. I think that should fix the issue. Share this post Link to post Share on other sites
CME 0 Posted December 13, 2016 in Trying to install UM2 Hotend but print cooling fans won't turn on Thank you. I will try that. One more question though. The PTFE coupler in the hotend is burnt and probably should be replaced. Can I use the UMO+ one? Share this post Link to post Share on other sites
neotko 1,355 Posted December 13, 2016 in Trying to install UM2 Hotend but print cooling fans won't turn on Nope sorry. UMO+ coupler is really really different to the UM2 ones. If you need to buy one I would highly suggest to get a TFM version + fixed spacer (any UM reseller has them or also 3dsolex TFT) since they last MUUUUCH more print hours. Is one of the parts of the upgrade that I love most since I don't need to change the couplers so many times. From from 50-200h of umo coupler to um2+ TFM/TFT 500-2000h is a BIG leap in time and money saving. Share this post Link to post Share on other sites
CME 0 Posted December 13, 2016 in Trying to install UM2 Hotend but print cooling fans won't turn on Sounds good. I figured out that I needed a fan splitter, and I had one lying around. Works perfectly now. Thanks. Share this post Link to post Share on other sites
