Video guide:
Text guide:
https://e3d-online.dozuki.com/Guide/Convert+your+stock+Anet+A8+to+the+Hemera+toolhead/131#s1512
Get the ready-to-go firmware here:
https://toms3d.org/wp-content/uploads/2019/11/Marlin2-source-A8-20191129.7z
https://toms3d.org/wp-content/uploads/2019/11/Marlin2-A8-Hemera-20191129.7z
Printed parts licensed CC-0. Marlin firmware licensed GNU GPL in accordance with the Marlin license terms https://github.com/MarlinFirmware/Marlin/blob/bugfix-2.0.x/LICENSE
//Updated Dec 23, 2019 to correct 46mm rod distance
Source files (these are both a bit messy, sorry)
https://a360.co/372UMuf
Print with a temperature-resistant material eg PETG or ABS
The author hasn't provided the model origin yet.