Can you add some more information about what you mean? There currently isn't any way to add custom modelled parts to Mecabricks, only decorated parts.

i mean like this piece. i wanna add it to the site but i'm bad at 3d modeling. or can we not do that
https://www.bricklink.com/v2/catalog/catalogitem.page?P=74528&name=Minifigure,%20Headgear%20Hood%20Basic%20Smooth&category=%5BMinifigure,%20Headgear%5D#T=C

The only way you could add it is by modelling it, then sending it to Scrubs.

i got it now thanks.