hey i just bought a 3d cosmetic for my right knee, i just activated it and it isnt working, what do i do

What version of TB are you on and do you have objects set on or off? You can check by doing /opt obj in game and it will tell you if it is 1 or 0, 0 is off 1 is on. It also tells you version of TB you are on in top left of screen of game. Also, what is the item?

type /lp 0 tori

type /dl yourtoribashname

type /lp 1 yourtoribashname

Make sure you are on the most up to date version of toribash and that objects are turned on

Looks like your item's texture is transparent - that's why it appears invisible.
Here's the default one: https://cache.toribash.com/objects/2773.tga
You can change the item's texture by pressing on its icon in your inventory.

it still doesnt work

Can you provide a screenshot of the issue?

https://imgur.com/a/3yb44A1
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it's activated but it isnt showing up
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i tried it and it isnt working

Very odd, are you on standalone or steam version? Try and delete your custom folder and re download yourself. Toribash > games > custom > Antipro123. If that doesn’t work try and reinstall.

im on the steam version

It works but would only be shown during a replay as that's a replacement joint obj.