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I printed this on our Ultimaker 3 and it worked well, although i did make some modifications.

Since i am making this for my kids, i felt the grip was a bit small, so i took the .STL into blender and made it about 50% thicker. I actually think it might still be a little smol, so for my second print of this i made it thicker still.

One snag i ran into on my first print was that the 'lock' boss was so close-fitting, when i glued the cap on the lock no longer disengaged - i couldnt turn the inner post because i couldnt fully disengage the lock ! Kinda funny, i should have paid more attention when gluing it down. Anyways, managed to get it to turn after shaving away enough PLA, but it was an unexpected hitch. For the second print i made the lock boss just a hair shorter, which should alleviate this altogether.

Overall great design - pretty surprised how well it works and how strong it is using PLA. I did use 100% infill because it made a negligible impact on print time.