For all of you facing the undervoltage issues:
I tried a lot of different power supplies, disconnected all peripherals etc to no avail.
In the end the culprit were neither power supply, cable, or peripherals, but simply my raspberry was overclocked!
$ sudo raspi-config -> overclocking -> remove -> solved!
raspberry pi 3B
Well we can't help if someone overclocks his/her pi and doesn't tell us. 
Glad to hear it's working now 
Thanks for sharing your solution 
conected dc/dc 10-60v to 5V 3a to gpio pins , and get rid of usb cables. now voltage ~ 5,2 V . don`t have undervoltage icon appearing anymore .
dc-dc module - is in this link
https://www.ebay.com/itm/FJ60D5C3-3A-DC-DC-Buck-Step-Down-Converter-DC-10V-60V-to-5V-Waterproof-Module/123503374938
Just curious if overclock is set on by default. Were you using the default octoprint image? I have this issue of undervoltage as well. I'm going to check rasp config when I get home. Thanks for the idea!