Update 4/23/23: Added a version that uses pennies as a weight.

This is a model of the microfusion cell from the Fallout video game series. Specifically, it's based on the Fallout 4 version (see pics). Note that the more curvy bottom section will make attaching labels more challenging than a less accurate cylindrical model would, so painting or using several smaller labels may be the way to go.

Four variants are included: a complete one for the entire cell, a split one designed for easier printing (with a hole for a 1/2" dowel for alignment), and two screw-top versions (one that uses pennies as a weight, and a general container one). The penny version has a threaded hole with a plug so that pennies can be added and clamped in place to prevent rattling (total weight when fully filled with pennies is 116 grams, but you can add as few as you like). The container one is really meant for adding more weight than a single stack of pennies for more heft, so is pretty thick in case it's dropped, but there's no reason you couldn't use it for general storage. Both the penny and container variants use the same lids. To account for printer variation five levels of clearance are included. I liked the fit of the 0.3 mm one. Note that all clearances are on the bottle top cover, so the bottoms stay the same.

No supports are required. Use a fine layer height or adaptive mode to preserve details. I found lightning infill worked very well. I'm painting mine, but if someone has good color match filament suggestions, please leave them in the comments!
 

Step versions are included to aid customization.