This is another mushroom cage for holding mushroom (or other) soft frags in an enclosed space with things for it to attach to. The normal usage is stick a frag plug through the bottom hole, then put various pieces of loose rock around it, followed by putting the coral in. If the frag plug is large adding the rubble may be unneccessary.

Additionally there's a bar that can fit through the holes from on-side through to the other, which is useful for holding the frag plug in place. Completely optional though.

This requires no supports and should print completely clean with PET-G, using the standard Bambu PET-G settings. I usually soak things in RODI water for a bit after printing, just in case, to clean them off. However I know others just use them right away.