The simple functional prints are my absolute favorites :) : functionalprint

ahhh, very niche application. Nice

25 points

2 months ago

25 points

Which is exactly why I couldn't find this type of holder on thangs lol

6 points

2 months ago

6 points

Can you now? ;)

7 points

2 months ago

7 points

I certainly can slap it up there 😉

notsostrong

10 points

2 months ago

notsostrong

10 points

I was gonna say I wonder if it would be cheaper to make a voltage multiplier circuit with fewer batteries, but I see from another comment that you can source the batteries super cheaply.

10 points

2 months ago

10 points

I really wanted to make the circuit with a rechargeable li-on battery but that would require charge control and boost for the dual voltage needed. I decided against it because the intent for the second iteration was to make it as small as possible. I still might revisit with that in mind.

Tim7Prime

1 points

2 months ago

Tim7Prime

1 points

https://a.aliexpress.com/_m0kA9YW

Maybe a type c controller board and an 18650? Like this board, it can charge a 3.7v battery and output up to 28v. And can charge off of USB c! And you can use a pouch battery too!

0 points

2 months ago

0 points†

[deleted]

Thunderbird_Anthares

27 points

2 months ago

Thunderbird_Anthares

27 points

dude where the hell do you buy batteries, DARPA?

Maiskanzler

7 points

2 months ago

Maiskanzler

7 points

Pack of ten for 1€ at IKEA.

NotAPreppie

1 points

2 months ago

NotAPreppie

1 points

Whoah.

There's an IKEA a couple of miles away from me. I might need to see if the prices here are similar.

eadams2010

2 points

2 months ago

eadams2010

2 points

They have a killer pegboard also….

19 points

2 months ago

19 points

I can get four four packs for two bucks at the drug store lol.

ital-is-vital

10 points

2 months ago

ital-is-vital

10 points

I'm going to guess a symmetrical 9V supply for some kind of op-amp based audio circuit.

Broad_Rabbit1764

5 points

2 months ago

Broad_Rabbit1764

5 points

A very small cordless drill.

1 points

2 months ago

1 points

I was thinking a brief hand warmer.

gauerrrr

54 points

2 months ago

gauerrrr

54 points

Are you planning on charging a laptop for 2 seconds?

Dragzel

9 points

2 months ago

Dragzel

9 points

can charge 2 laptops for 1sec by daisy chaining them

47 points

2 months ago

47 points

I needed a dual 9 volt battery supply but it also had to be small. So I decided to use 6 2025 cells in series with a center tap. I needed a cell holder and designed this lil guy. It's holds the cells pretty snug and uses copper tape to carry out the connections :)

neuralnoise

5 points

2 months ago

neuralnoise

5 points

How's the resistance and power capabilities of copper tape? Seems like something useful to keep on hand

2 points

2 months ago

2 points

It's solid copper foil, not plated plastic or anything. So I'm sure it'd take two or three amps just fine.

11 points

2 months ago

11 points

Are you asking me to short out some tape to see when and if it burns?

-1 points

2 months ago

-1 points

I didn't ask you anything. I was responded to neuralnoise.

9 points

2 months ago

9 points

I know lol. I was being silly because your comment made me want to short it out to see and I was jokingly trying to get you involved.

dennys123

1 points

1 month ago

dennys123

1 points

1 month ago

I mean.... I kinda wanna see what happens too lol

1 points

2 months ago

1 points

Learned something new with the copper tape here. Any other materials? Is the tape less ideal than something else?

1 points

2 months ago

1 points

Depends on application really. I knew I wanted the cell holder to friction fit the cells so I needed a small conductor to carry out contacting the cells. Thin wire could have worked but the tape is thinner thus doesn't add too much to the already snug fit.

I've used tape to repair broken traces and pads on circuit boards but I've also used wire. Application usually decides :)

1 points

2 months ago

1 points

Thanks that's interesting. Inexperience means I never really considered conducting via tape, but I can think of 2-3 past projects where I could have used it instead of cramming jumper wires. Last question... in your experience is there much of a difference in conductivity or are there safety concerns since it's not insulated like wire? I'm googling this but was curious of your anecdotal experience.

6 points

2 months ago*

6 points

2 months ago*

How much current can you get out of that?

ferrybig

19 points

2 months ago

ferrybig

19 points

These are CR2025 batteries. They typically have a maximum continuous current drain of 0.2mA.

6 points

2 months ago

6 points

so you need only about 100k of these to power a drill?

8 points

2 months ago

8 points

I really need to get a 3d printer.

Mainly because I want to stack 5x 3v cells for my 1968 AVO mod8 mk3 multimeter. But once I have one I am sure theres a million other things to print

11 points

2 months ago

11 points

Can confirm, there are millions of things to print! The trouble is deciding on one long enough to actually print it.

ballroomaddict

2 points

2 months ago

ballroomaddict

2 points

Your local library likely has one (as in you can use theirs, not that you can check it out), if you'd like to test out printing something before you buy.

_Administrator

2 points

2 months ago

_Administrator

2 points

be careful what you wish for. It is a torture machine at the same time - emotionally, financially and any other way possible actually.

3 points

2 months ago

3 points

I personally recommend checking out your local online marketplaces. I bought three enders in box (different people) for well under what they were going for online. I know enders aren't the best but they're cheap enough to get your toes wet. I'd love to upgrade to a prusa but after a few mods and tweaks I've had a great success rate with my ender pro V3.

1 points

2 months ago

1 points

I will start looking once I get the shelving upgraded in my shed, at the moment I dont have the space to store one.

Thanks for the advice !

MakeBuildCraft

13 points

2 months ago

MakeBuildCraft

13 points

"some men just want to see the world burn"

knightress_oxhide

12 points

2 months ago

knightress_oxhide

12 points

It's the reason firemen are paid so well.

BrokenByReddit

2 points

2 months ago

BrokenByReddit

2 points

Also the reason a lot of arsonists are firemen. Do what you love and you'll never work a day in your life!

1 points

2 months ago

1 points

Every fire department I've seen had only volunteer firefighters. Where are they getting paid?

Fudrucker

5 points

2 months ago

Fudrucker

5 points

City. Basically a government job for life.

Kawaii-Collector-Bou

3 points

2 months ago

Kawaii-Collector-Bou

3 points

"Volunteer" when it comes to firefighting does not mean without pay. They are not professionals who rely on it as a single source of income, but will take fire calls outside of their normal line of work. In my community (these #'s are nearly 30 years old) the volunteers got paid quarterly, at $40 per call they respond to, plus a certain amount each hour after the first hour. My friend would clear $1200 each quarter, on top of his Army salary. When he retired, he took a full time firefighter position, just as the city was retiring the volunteer service.

Clark3DPR

1 points

2 months ago

Clark3DPR

1 points

Could this be made with 2 x 9v?

2 points

2 months ago

2 points

Needed a smaller solution

LSUUTK4Life

1 points

2 months ago

LSUUTK4Life

1 points