I had six Roomba 620s. Two recently died the same death - the blower stopped running. The dust bin is fine - it works on other Roombas. The little contact tongs on the Roomba that make contact with the aerovac power pins are fine. I've done the 10 second reset and the battery removal hard boot. Nothing works. I took the first one apart, hoping to find a blown transistor on the motherboard. That expedition just turned into a disaster. I'm not going to repeat that. But I'd sure like to fix the Roomba rather than throwing it out. Do you have any relevant wisdom you're willing to throw my way?

That's really impressive. Congrats on picking up the cad skill. Really impressive.

The YX8018 is similar and has a chart on it's data sheet. you very the current out put by changing the inductance. If you set it up right, you could tell the inductance of a coil by the current you read.

@1:52 - That would not, alas. At least 1 mm of steel casing should be needed. Steel, not alumin(i)um. And some glass/asbestos/PBI fabric for inner layering and underside - for the worst case.

add layers

You may want to include some cutouts between the compartments to help with your retrieval from the bins.

Thank you for another enjoyable video.

Cool project and great idea. The flame resistance of the resin is amazing. Kevin Loughlin has been posting some tutorials on Free Cad kind of centered on how to do scaling, making gears and avoiding quirks. Might be interesting. His YT channel is @loughkb

Would it make sense to add an overtemperature (fire) alarm? And handles so you can rush them outside, to a safe place, should a fire happen?

I know that you used to do model railroading. I was wondering about the flexible LED filaments you featured. Could they be used in lighting passenger car interiors? Thank you.

omg --------- i saw the metal box idea ---- uh, then i thought "is that how you build a bomb?" then i thought, wait, do lithium ion batteries need oxygen to burn? ai said --- omg, lithium ion batts generate their own oxygen, the devils!!! ...... my idea would be - just those plano boxes, or a cheapo version, and small batteries tossed into little compartments, and larger ones in larger compartments......and so it's easy to have one compartment, one battery..... i feel planos are cheap, easy to adjust and stack, easy to expand. .you guys no a lot more about this stuff than me, but i just don't like the idea of a metal box holding lithium batteries. .love your vids! and, what sacrilege! you didn't pop a stout at the beginning of this video. i'm guessing this video was a morning one. , have a great 2025, health and happiness.....

The printing work is well done, as for old lithium type batteries, I put them in a bag the city supplies and they go for recycling, if a project arises where a battery is needed I will buy new. Hard for me to do being a hoarder of sorts, but reality is most squirreled away items are seldom ever used.

I have been storing salvaged batteries in those metal ammo cases from Princess Auto

Adhere a cheap voltmeter inside the lid the bin so you can check voltages conveniently. Maybe add a chart of your target storage open circuit voltage range for various cell chemistries.

I think I would have printed the racks to hold the batteries vertically since the metal container is so high.

Hate to break it to you... But all that plastic is basically fuel. Enough to get the cells nice and hot before they start popping. I don't think resin is rated as a fire retardant. And that tin close at hand is probably a good thing to have if you are experimenting. You can lob the damaged lithium cell in the tin, grab it and run outside, holding your breath... But if you are so worried about exploding batteries... Think for a moment. What happens when someone throws a match in a box of fireworks. A great big deep tin of lithium batteries encased in molten bubbling burning plastic is basically a dripping smoking burning nightmare, too hot to carry, that could explode at any moment. Personally... I keep my salvaged cells in several plastic boxes in small quantities, individually wrapped in plastic. I also do voltage spot checks every month. No crushing, bumping or shorting. Happy little cells.

Don't laugh.. but I stored all my lithium batteries ( power tools type as well ) inside a pressure cooker while on vacation. :)

Lithium batteries, "Usafe at any charge". Now you just need taller modules with narrow sections where you can slip those big flat cells into.

Street lithium, sounds like street meat - i have 1 so far, put to use in a portable radio - free

Great solution.

I am not clear why you chose to print these trays using the resin printer rather than using your normal 3D printer

7:27 would have put some plastic sheet in first and printed without bottom layer, but fire test, cost vs security ? security would need a top layer too i guess. googles/youtube unmentionable : An electronic cigarette (e-cigarette), or vape, have not seen any on the streets, nice people or a lot of scavengers ?

I keep mine in individual plastic baggies, with the terminals taped, inside a metal box.

I figure storing batteries in plaster lined containers would help contain heat and maybe the potential blast , One crazy idea i did have was 3D print a container that’s hollow with no supports inside then create a hole in the shape and pour a load of plaster paris in it so it makes it strong and fire resistant? , If i had enough motivation maybe id give it a go but its all theoretical at the moment 😀

Always good.

Neet project, I like it, that's a lot safer way to store your batteries then what you had before, nice.

Very Nice, still have not found a v battery even with your suggestion )-;

It would have been less effort to print them out of pla and cheaper too. The best way to store them is in a project 😅

I like the solution you came up with it's 100% safe but for sure safer. P.S. More Power

What we all want to know is- what kind of coffee were you drinking? Also, do my eyes deceive me, is that a Binford mug? That looks like a great solution. My sole concern is that the metal of the can is too thin to resist the result of “chain fire” when one burning cell sets off others. Hard to test for though

Ha bisogno di qualche accorgimento, ma nulla da dire , per i 4 componenti utilizzati 👍

I thought the cup of coffee was the unusual thing. 😅 yes it is good to pur your printers to use. Good. Job

Is there no nice kit to build that can recognize colors with some little probe ? Could be very practical for me too ... Somehow translated to 'words' like 'green', since I many times call things green that others call blue and so on.

I had two of the BNC-to-binding post adapters. Both failed when the spring under the knurled barrel of the BNC connector ate through the barrel reducing spring tension to zero and, thus, affording poor connection of the BNC connector to its mate.

RFID Cards from hotels. Yeah, i always find these cards laying about and scoop them up! "cheap n free" I call em. Where else can you get free cards to play with OR in my case, re-impliment them for useful cards. At my job, we have RFID entry, and you know how some folks are lazy... I found myself locked out of the building a few times, waiting for the next guy to show up. (Mind you I am the guy who opens the building, turns on the lights, shuts off the alarm and starts the time clock.). Compliments of the local hotel, I have several entry cards to my job now and no one knows the wiser. Cold snowy days aren't so bad now because I've washed a few in the laundry.

Very interested in seeing a follow-up video on the RFID reader\writer. I bought a 100 pack of the cards and a handful of the modules with the idea of making a card game that I could play between two players over the internet with a server monitoring and reporting on the game Perhaps all those automotive lights could become street lights for the train sets with a custom light pole you print out

Found this video on amazon reference. Bought one of these without any instructions at all. glad i found this video A++ for providing instructions

50Ω & 75Ω BNCs are different: a 75Ω plug will not have the dielectric sleeve.

LED - or as they call them in China - 3D Shadow Light. 😄

I really do appreciate your build video. Could you share with me about the blue “holding” putty. I think that would make my build a little easier. Thank!

Put the long 'filaments' inside canning jars, suspended from the lid. Novelty lamps.

flex filament led, countdown 9 - 0 for new year, got a bit of time to design - iterate - build, could even add those automotive leds (if you have 50) for the seconds leading up to countdown ... or auto leds alone, need only 23 (5/2/2/5/2/2/5) to make number 8, 0the rest need less.

I recently got some of those LED noodles too. I am thinking of making some "neon"-like decorative signs with them. Could provide nice outline lighting for a cool robot too. Thanks for the mailbag!

Hi, just an idea, maybe only publish items that have not been seen for a while, it gets boring when the same item is show over and over again. Having said that I appreciate your content and always look forward to Mailbag Monday. 👍👍

BTW make a robot. It will drain your pile!

FYI- AE has search by picture. Haven't used it but it pops open every time I login.

it's. not as fun as asking, but video editors have color grading stuff, polariscopes and regular scopes for color across the frame

YELLOW

In seeing those flex LEDs. I'm thinking of higher tech version of taping glow sticks onto black clothes, in the form of a Stickman.

I want like a 5 foot filament led deal like those.. the wiggly ones…. Itd be cool if they were rgb programmable lcd sized so the color is linear.. but im asking for something thatd likely cost as much as a small oled tv..