Looks very practical to me.
From the “installed” image it looks like the holder is glued to the counter top. ?
I can see that you are enyoing your 3D printer, 
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I used Tesa powerstrips to install it, so that I can remove it easily in the future if necessary.
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How many parts to print a new caravan?
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How big and do you want it and do you want wheels to turn . . and what do you have for 3D printer and how big . .What are you using for Slic3r ( G-Code maker ) I use Prusa version 1.3.9 of Slic3r and what is it your using for running the 3D printer ? I use Repetier-Host 1.6.2 never misses a beat . . Oh yeah and your definition of a CARAVAN ! 1 or many LOL ?
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A holder for the kitchen scales in the caravan…
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Starting a set of dust collection adapters (who knows why all manufacturers make incompatible ones?)…
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Seems your not the only one who has to or ends up making a part to fit the Job . . Like the Ideals you had there . . NICE WORK !. . What threading Extension did you use for the hose ?
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I’ve modeled the threads without a specialized extension.
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Cotty’s The Man!!!
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I’ve followed Daves tutorial 
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Out of curiosity, have you modeled and printed internal threads for machine screws or bolts? If so, how is the fit when you insert the screw?
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perfectly matched color 
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Not until now, this one (for the dust collection hose) is only very rough and does not have to fit very precisely. I would probably use metal inserts for reliable screw connections…
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Have you looked at adding metal threaded inserts during printing?
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No, some time ago I watched this interesting video and decided to try this one day, bit I didn’t have to print something with threads until today. Have you used that technique already?
Edit: forgot to insert the link 
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I haven’t used it yet but there’s some parts I’d like to do for the robot that could benefit from having threaded inserts.
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Now that sounds good. . Maybe you should write a Extension for that kind of thread …close to a LAG screw settings . . Can you give me a Ideal as to how you made these Screw in threads ?
I’m using the technique explained by Dave in this tutorial: