I've received a PM about the toolbox I have designed 3d printed for the VB-TT-023. If anyone wants the .stl file to print it yourself, feel free to download in on thingiverse:
https://www.thingiverse.com/thing:6988838
I suggest using PETG for this box, as it offers flexibility aswell as heat stability and UV resistance. Both pieces can be printed without support if you flip them to the flat side in your slicer. You'll need two M5 screws to attach it to the frame. Sadly using this toolbox, you will not be able to mount bottlecages in the frame correctly any more. I haven't found a way yet to circumvent this, but if I do I'll post a new revision.
Awesome!
Cautionary tale. 3d printed stuff tends to fail catastrophically in ways injected molded plastic doesnt. I had a 3d printed box behind my seat post on my propel, it worked until it just exploded. So, people, when you use 3d printed parts, be mindful of print orientation / layer lines, material fatigue, stress points, how to reinforce a print with non 3d printed parts like inserts, mesh and so on. Don't be like me, basically. Especially those who just DL free STLs from Thingiverse and send them to print without giving it much thought.