Flail Snail

 The Flail Snail is one of the goofier monsters to be created for D&D. I think it came from the Fiend Folio, though I'm not 100% sure and I'm too lazy to look it up right now.

Here's a 3d-printed model of it, along with Scaley the Filthy Bartender (from Reaper) for scale.

The model was made by Miguel Zavala, and printed by me at 0.08mm layer height in PLA. I've tried to represent the iridescent shell by spraying random blobs of transparent inks over a silver base coat, and then applying liberal coats of gloss varnish; I think it turned out OK. The colour scheme is taken, more or less, from the D&D 5e illustration.