Asklemmy

I have a reusable bag. I repaired the seams at least 6 times.
I really love the bag, I got it from CES about 7 years ago. And even it's an evil entity now, it is hands down the best reusable shopping bag I own.

Me.
A lot has and continues to go wrong, but mostly self-repairing. At some point some failure will be unrecoverable, but hopefully that's a long time in the future.

An even better answer might be my cats. The small number of repairs that need professional assistance are cheaper than the same issues would be for myself. However I don't expect them to last as long, unfortunately. Even though I got them very nearly brand new a few years ago.

everything i own is repairable because i end up buying decade worth of equipment.

My Thinkpad:

3d printer. Just wish I didn't have to do it so often.

My Rancilio Silvia espresso machine. Easy to take apart and replace anything. Parts are readily available from many sources. Also, my BMW 3 series, but I’m a BMW tech, so I better be able to fix anything on it. But it’s 14 years old and is like working on a horse cart compared to the current ones. Luckily BMW are designed to be able to fix anything on them, unlike most other brands. Don’t even get me started on Tesla, what absolute junk.

I mean, half of my hammers have had their handles remade with whatever hardwood was closest. So I'm gonna go with those.

However, the most complex thing that I can repair with sourced parts would be either my truck, or my truck. I've had to fix it with "close enough" parts before, and I will fix it until the frame rusts (which given Northern states and salted roads probably won't be more than a few more years)

There's a smattering of electronics that I've seen mentioned multiple times as well.

One thing that is theoretically repairable, but is hard to find parts for, my washing machine. It's a old 50s model with a lever to engage the motor, a roller on top to squeeze water out, and a simple steel gear system to drive everything. I should be able to open it up with a crescent wrench and flat head screwdriver, but I doubt I will ever be able to find ready-made parts (I have looked briefly when I thought I had a problem with it that sorted itself) but I might be able to bodge some things together if needed.

Since my background is in PC repair... my PC.

Bicycle

I'm pretty good at repairing computers, but please don't tell my friends and family.

I have a few.

Blunt umbrella - all the parts are replaceable, big win.

3d printer - I am confident I could replace any part that dies. It's not the newest or the best, but it's mine.

Also our humidifier is, in theory super fixable, a venta air, but it's been rock solid and hasn't needed work yet.

cast iron and carbon steel pans

Strictly speaking here, something that could be fully repaired by the actual tools I have without just swapping for new purchased replacement parts would probably be one of my guitars. I could essentially make every piece of them from scratch if needed except maybe the pots, caps, and truss rod. I could probably repair the truss rod but making one from scratch would be tricky. If I had an acoustic guitar, that would be an easy answer.

It might not turn out well, but I could make it playable again.

I could repair anything on my bike, and kayak. I might be able to rebuild my snes on a component level.

If you allow replacement parts, almost anything can be repaired of you are willing to spend enough on it.

Most repairable thing I have is probably my truck. It was made in 2007, before they started to take away user serviceability.

Oh also I have a bunch of old computers that are very repairable. I mean, I would need the right components, and I can’t make those myself, but if I could source the components, they’re really easy to repair. Probably the hardest thing to repair would be the sheet metal.

My tools. I've amassed quite the arsenal of hand and power tools from 1840-1970. I refurbish and rebuild them into much higher quality workhorses than you can get these days for a fraction of the cost. Even if the price of modern tools wasn't of any concern, outside of two very premium niche manufacturers, you literally can not get good tools anymore. Nobody makes them. Home improvement stores are full of poorly designed, low quality garbage for people who have never used an actually good tool before. No one has made a made a good combination square in so long that most people have never used one. Chisels and saws are a goddamn tragedy. Power tools are all run with chips than burn out, are covered in plastic guards that break or melt, and are running entirely on brand favoritism from people that don't know they've been had. My table saw is from 1953. It cost me 40$ and an hour of sanding rust and tuning. It has one mechanism and will eat through anything. My band saw is from 1968 and cost me 60$, plus 28 for new guides and tires. My favorite chisel is from 1884, and cost 5$. I still can't find one I like nearly as well in any other size. My favorite block plane was 6$ and an hour of tuning. It's from 1878 and kicks the hell out of the 40$ Irwin dogshit I picked up before I knew better. My panel saws have been used hard for 160 years, and will not only outlive the disposable garbage from home depot, but will do a better job and outlive me.

I've made a hobby of bringing anything I can find at thrift stores back to life. It prevents waste, and keeps a tool that had real care put into it's development from ending up nailed to the wall in applebees. As a bonus, collectors generally hate refurbished tools, and I hate someone removing things from the shrinking pool of good, cheap tools so they can put it on a shelf or try to sell it for hundreds as a rarity.

My PC in terms of being able to swap everything out, at least while parts are still available, I won't be surprised if the RAM shortage was an attempt to try to kill parts sales for PCs at some point.

probably my frankentein computer... when I get a framework it will be that

Or anything else that works by design

Not my fucking 40 year old knees, that’s for sure.

I agree with @Tolookah@discuss.tchncs.de the 3D printer is also very repairable.

My 3d printer is half 3d printed and a fourth recycled garbage. I've laid hands on every single part in her and hopefully soon I'll replace the box as a whole with a vintage tv cabinet and finally put a 30cm heated bed in her. The only thing I can't replace is the thermistor because I don't know how to program for a modem one.

My heavily modified project cars. There not even heavily modified in cool ways either...there's just no parts available anywhere, so I make other crap fit.