We got some feedback from people which are building their own Hector 9000.
Thank you very much for the feedback!
Some of you pointed out that it is very much work to assemble the valves, because it is neccessary to customize the diameter of the original servo horns. So we tried to create a cam which you could directly mount to the servo shaft.
Because it is nearly impossible to print the splines of the servo shaft with an ordinary FDM printer, we think it could be possible to press a cam directly onto the shaft and secure it with a M3 bolt. We propose to use PETG or ABS for the print.
Unfortunately our printer is down for maintenance so we could not test the design. If you decide to try the new cam, it would be nice to get some feedback. You will find the .stl file for the cam in the download area as a single file (not included in the stl archive).