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A battery dispenser is a surprisingly hard design problem with multiple trade-offs and decisions.

I'll discuss this more in the design notes; the only question I'll address here is \u201chow many batteries should it hold?\u201d

My answer: infinity.

One of my design goals was to make a battery dispenser whose basic shape repeated itself so that it could be extended as far as you would like. Other than for the very bottom, I achieved that, so that you can make a battery holder as large as you want.

The basic battery holder holds 20 batteries. But you can add as many additional sections as you like, either in your slicer or printed separately and then attached via cable ties (if your print bed isn't large enough).

Variations

The original design holds 20 batteries and I've never had a problem with jamming.
The 15-degree design also holds 20 batteries and includes extensions for 8, 16 and 32 batteries

Print / Assembly Instructions

Minimum assembly requires one right side and one left side. The right side does not require supports. The left side requires supports under the very bottom of the dispenser because the final lip doesn't go all of the way down to the build plate to make it easier to grab the battery.

On my printer, a press fit between the two pieces seems sufficient. If you would like to reinforce, the holes in the cylinders are wide enough to fit a standard cable tie. Or you can always glue them together.

Design Notes

This project began when I downloaded a cool-looking battery dispenser from Thingiverse (moment of silence). I printed it, loaded it with batteries, pulled out the first battery and\u2026it jammed \u2013 no battery popped into grabbing position next.

A battery dispenser is a surprisingly hard design problem with multiple trade-offs and decisions.

You want to keep it as compact as possible.

You can make it shorter by reducing the ramp angle, but the increases the probability of jams
You can make it deeper, but that also increases the probability of jams because the batteries can turn sideways

You also want to make it easy to get the batteries out, but not so easy that when you take one batter out, they all roll out.

So you have to play around with dimensions, angles and tolerances.

I've uploaded two variations on where I eventually landed.

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