One of my kids chewed the plastic cap of the holder so I searched an identical one to print. It's a remix from @thomasan available on https://www.thingiverse.com/thing:3081121
I could have printed a cooler one, a fancier one but yeah, I decided to go for Vintage!
The author remixed this model.
Their design didn't have a dent to keep the smaller tube inside the big one and prevent the spring to get out. I also updated the size to 85cm to match the set I have. This is made to be used with the spring if you happen to brake one or both plastic pieces.