After gotten some inspiration from an rc forum I made this, it's a tool to help you get the links and shocks for your rc car just right.
For links just mount them in the device and the anglethingie shows how close or far from having them the right length.
If you want to check your skock mount them in the device and push down on the slider, if there are any difference in springrate the anglethingie will move towards the side with the softer spring. This device have been tested with soft crawler shocks, I'm not sure how it will cope with on road or buggy shocks
I've deliberately made it without any more markings than center marking to allow for easier overview and if you for any reason want to make your own markings there's plenty of clean space for that
After you've printer just put a m4 screw through the "bricka" and put the bricka in the anglethingie and then mount it all to the ruler like seen in the picture with a nut on the underside of the ruler, and if you have any questions just let me know and I'll try to help.
And try not to mind the bad surface in the picture, my printbed apparently have some dents in it :D
I've printed mine in pla and just used whatever setting that suits my filament, I suggest you do the same. Since there will be some loads from the shocks you do need to have at least 20% infill, maybe more.
The fitting for the slider are quite tight to eliminate any misreadings because of it moving around so make sure you set up your printer for high resolution print
I managed to squeeze all the parts in on my printbed, putting the bricka and ruler upside down and the slider pointing up but you know your printer best and print whatever way suits your machine