You might be able to hold it down with cable ties while you print the other parts.
I tried the cable tie but that didn't work out. I drilled some extra holes to attach the ties to but they didn't hold... I'm thinking of a little aluminium block now which I can produce at work. The drawing is already on paper, can't wait to make it tomorrow and test it!
A little adjustment in the design is probably an easy and quick solution for new Ultimakers. A little bit of extra wood/ tighter fit for the coupling will do.
You missed the part where he said that he could not print anything while he has this issue.
When I tried to print that part my coupling popped out again :-)
My first try was to get a piece of aluminium with a tapped hole to fit the coupling. Since the thread is NPTF it's difficult to find a tool to do that (at low cost and fast) so I ended up with new, 6mm lasercut steel sides on my assembly.
A bit of overkill but it works fine so far. It also seems the noise is reduced a little with the extruder mechanism now bullet proof. Not too sure about that one though...
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Daid 306
Your wooden pieces don't look the same as the military grade, because those are new cut parts by the design posted there.
I've seen a solution where there was just a screw inserted to hold the coupling in place. Sadly, I cannot remember the details nor do I have a picture.
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