These are the web shooters based on the one Miles Morales uses in the PS4 Spiderman game.
The web cartridges are removeable and lock into place. You just need slide one into place and it should click, lift the lock tab and should be able to remove it easily.
These are not multi material it was just painted afterwards with oil markers.
Everything should print without supports if you use the orientation I always have the parts in, or look at the picture below.
Print Settings and orientation:
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