Who doesn't love a gelatinous cube? Here's one, with an included corpse puddle for when your party decides they've had enough.

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Anet A8

No

Yes

0.2mm

15%

I split the process at the top and printed with 0.1mm layers to get a better rounded top. You should be able to put minis in under it but you might need to scale it up a bit depending on the height of your minis.