
A recent experimental video by YouTuber "Kisumi" (@ksmhope) has gone absolutely viral on X (formerly Twitter). The clip, which compares a 3D-printed zipper to a traditional one, has left countless viewers in stitches.
In the video, Kisumi takes on the challenge of pitting a 3D-printed zipper against a classic from the renowned brand YKK, aiming to see which one holds up better in terms of durability and practicality. First up, he fires up his 3D printer, crafting a zipper that takes about 1 hour and 20 minutes to complete. The 3D-printed version clocks in at a mere 30 JPY, a significant steal compared to a standard YKK zipper, which typically retails for around 200 JPY.


Kisumi kicks off the test with the genuine YKK zipper, effortlessly sliding the puller. The zipper closes smoothly and stays securely fastened, no surprises there.
Next, it's the moment of truth for the 3D-printed zipper. It also closes and holds firm, but here's the hilarious twist: when he tries to open it, it's completely stuck! Turns out, this 3D-printed marvel can close, but once it's zipped up, it's sealed for good. Talk about an unexpected, mind-blowing revelation!



Viewers couldn't get enough of this "cursed zipper" epic fail, flooding the comments with laughter. "That result was so unexpected, LOL," one user wrote. Another chimed in, "This zipper was clearly designed only to close." Many found it incredibly amusing that it could close but never open, with some even dubbing it the "cursed zipper" because once it's on, there's no getting it off.
Beyond this viral experiment, Kisumi regularly shares more engaging DIY and experimental videos across YouTube, X, and Instagram, drawing in a massive following. His creative flair and witty humor have turned his videos into internet gold, captivating a huge audience with every new upload.