RUmi sword wip.gif
October 8, 2025

K-Pop Demon hunter : RUmi's sword - LIGHT UP

Aaaand it’s done! :)


Test prints are complete, and all the parts fit together nicely. I just need a little more time to record everything for you so you can see it in action — but I didn’t want to keep you waiting, so here it is:

Light-up version of Rumi’s Sword from K-Pop: Demon Hunter!

As mentioned before, the key things I wanted to solve were:

  1. Make it easy to print – ✅ Done!
    Includes both STL and 3MF files. Only 2 parts need a tiny bit of supports; the rest can be printed support-free.

  2. Make it collapsible (easy to transport) – ✅ Done!
    You can take it apart and reassemble it with ease.

  3. Avoid expensive light systems ( taht can ammount to over $100) – ✅ Done!
    This version uses a lighting setup that costs under $10 and still gives you some nice lighting effects. I’ll show it all in the video once it’s ready.
    It also uses a 18650 battery, which you’ll be turning into a small power bank.

  4. Add enough strength so it doesn’t break too easily – ✅ Done!

So, fire up those printers!

The video will be ready in a day or two, where I’ll walk you through the setup and answer any extra questions you might have — but I’ve done my best to make everything as simple as possible.

Happy printing, guys! :)

Comments (14)

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Craven112 · December 1, 2025

do you have a link for the lights that you used please

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MysteryMakers · December 1, 2025

yup, links , photos, guide, tutorial, all of it is in the project folder :)

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Mike Hillis · November 23, 2025

i just joined how do i get the sword

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MysteryMakers · November 23, 2025

Ill send it all over to your inbox so its all in one place :)

J
Joshua de La Torre · October 12, 2025

Has anyone made this yet ? I’m trying to fish the light strip into the tip to loop around . Very difficult

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MysteryMakers · October 13, 2025

yes i've seen some posts in FB grup allready. attach a piece of string to the strip, to loop it arround easier. ofcourse longer tweezers will be beneficial in this case

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Pooadrid88 · October 12, 2025

how do you do it? i have like a million things on my print list, and i mean they eventually sell, i know its sometimes a long game but still. how do you manage to choose which project and to sit and knock it out

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MysteryMakers · October 12, 2025

i dont realy sleep much :D hahah, no just kidding,, i get tons of messages and i read all comments and messages and posts and get a sense of what peiple want. there is allot people want but i try to estimate what is the "highest" want at the moment, ofcourse the time is limited as i can only be in 1 place at the given time so i do miss allot of stuff i want to make , and try to eventually catch up :D

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Sarah Something · October 9, 2025

You're the best, have I mentioned that before!? Any plans for Mira's woldo?

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MysteryMakers · October 10, 2025

very kind of you :) to be honest i have several other projects open that i plan to wrap up, so i would not be able to finish it by halloween, but down the line i might make it. i have found it very difficult to get decent refernces for weapons, most of them are just artist interpretation :/

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Cosplay4000 · October 8, 2025

Amazing! Is 0.5m and blue the right specs for the light?

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MysteryMakers · October 8, 2025

oh good thing to point out, will update the photo, here's the one i used " 11keys Remote, Warm White, 4m " ... altho 2M should be enough . i took more bcs you can always cut away the extra

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Damien Moreau · October 8, 2025

The GOAT has spoken 🔥🔥

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MysteryMakers · October 8, 2025

too kind :D