How fast can this gearbox spin?

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3D Printer Academy

3D Printer Academy

Жыл бұрын

Building a DIY 3d printed gearbox with extra big gears from scratch and an experiment of spinning it from the other side. Satisfying ASMR custom engineering build, using a drill, and showing how to 3d print.
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Watch next:
Episode 6 - How long will it take for the last gear to spin?: • How long will it take ...
Episode 5 - Is it possible to spin the last gear? • Is it possible to spin...
Episode 4 - Generator: • Homemade GENERATOR GEA...
Episode 3 - Drill: • 3d Printed Gearbox + D...
Episode 2 - Speed Test: • 3D Printed Gearbox - S...
Episode 1 - How fast can they go? • 3D Printed Gearbox Ser...
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#speed #engineering #asmr #satisfying #satisfyingvideo #gears

Пікірлер: 385
@galinrashkov7645
@galinrashkov7645 Жыл бұрын
I would recommend using bearings on each wheel and decrease significantly the gaps between the different gears (Use teflon rings)
@zeicanofficial
@zeicanofficial Жыл бұрын
Exactly what I was thinking, I was really thinking it would significantly decrease friction.
@ghostlyninja125
@ghostlyninja125 Жыл бұрын
Journal bearings would be best
@Xavier1...
@Xavier1... Жыл бұрын
I'm guessing that adding a lubricant like oil would also decrease friction? Maybe transmission fluid idk?
@wachocs16
@wachocs16 Жыл бұрын
Also add a chanfer on the bed side of the print. You can se the first gold gear to have a big elephant foot (Layers squished at the bottom) and maybe add grease Teflon or brass washers would be good to pack them more thingly and reduce vibration Also this type of gears are really dangerous at high speed. Never be over the axis of rotation. If you reach really high speed inside your house you can get your ceiling damaged, electrodomestics and pets
@danielschmidt7703
@danielschmidt7703 Жыл бұрын
Agreed
@mubinzombadkar9112
@mubinzombadkar9112 Жыл бұрын
6:34 That sounded more like a giant diesel engine just starting and revving to warm up.
@neosstuff
@neosstuff Жыл бұрын
Ikr lmao
@spiderfreakgaming2537
@spiderfreakgaming2537 Жыл бұрын
Agreed
@LoganPlayz12
@LoganPlayz12 Жыл бұрын
Ya
@hoileanchung
@hoileanchung Жыл бұрын
Yup
@mr.propergaming1605
@mr.propergaming1605 Жыл бұрын
Gearbox in a trans
@jamesfulerten8494
@jamesfulerten8494 Жыл бұрын
Ever heard of...spacers ? They, when lubricated, can make a more stable machine and make it easier to turn.
@OhLonesomeMe
@OhLonesomeMe Жыл бұрын
Yes, I was waiting for someone to say that.
@noahc8997
@noahc8997 Жыл бұрын
YEAH
@Parking_cars_is_cool
@Parking_cars_is_cool 3 ай бұрын
Bro, why do you sound like your trying to be rude? You just are saying it in a rude manner.
@lobdaboss
@lobdaboss Ай бұрын
@@Parking_cars_is_coolbecause he kinda is! It’s obvious to use them so it’s surprising he didnt
@oeliku3033
@oeliku3033 Жыл бұрын
Some suggestions: 1. use spacers on the axle, so the gears are fixed on there to prevent wobbling and gears grinding against each other 2. use a normal M8 steel bolt instead of the aluminum rod and screw it far enough in, so you dont get vibrations in the gears. That way, the gears wont come loose as well 3. use ball bearings on the housing AND the gears 4. reduce the contact area of the higher gears. So 1st gear has the most contact area and so on 5. lube the gears and bearings 6. print the grip sideways. so it doeant brake (obvsly) 7 maybe try different gear geometries. there a some that are better for high torque or high speed. the latter have much less drag. 8. you can safe an enourmous amount of weight on the last gears. make them much thinner then they are now
@spaceenjoyer42
@spaceenjoyer42 Жыл бұрын
Nice suggestions 👍
@gumby5068
@gumby5068 Жыл бұрын
Can’t put ball bearings on the gears that’s not how gears work. (At least the input gear thinking about it now ig all the other ones could)
@M.Inam11
@M.Inam11 Жыл бұрын
Bro have write his school essay
@andrewkarsten5268
@andrewkarsten5268 Жыл бұрын
@@gumby5068 he’s saying put the ball bearings where the gears are connecting to the axel. That way, the gears have less friction trying to spin. Like how skateboard wheels are connected to the trucks, they have ball bearings to decrease friction
@isnipebunnies2825
@isnipebunnies2825 Жыл бұрын
@@gumby5068 note that most of the gears are freely rotating on their shafts. Only the first gear is keyed to the shaft.
@TheB3
@TheB3 Жыл бұрын
2:39 Love the physics-ignoring transition
@anaveragecanadian5061
@anaveragecanadian5061 Жыл бұрын
He did a quantum tunnel
@borntoclimb7116
@borntoclimb7116 Жыл бұрын
Lol
@Zextranet
@Zextranet Жыл бұрын
Not to mention the fact that the final gear spins faster than this guy is spinning the lever. This guy somehow made energy out of nowhere; this violates the first law of thermodynamics. Tbh, lets exploit this glitch to create free energy
@abercrombieblovs2042
@abercrombieblovs2042 Жыл бұрын
@@Zextranet Akschully, he's expending as much energy turning the crank as you could collect with a perfectly efficient thermal generator
@StrikeEagIe
@StrikeEagIe Жыл бұрын
Yes
@fetusness
@fetusness Жыл бұрын
Sounds like straight cut gears ⚙️ they were spinning FAST!
@Audi_Sport_Quattro_S1_E2
@Audi_Sport_Quattro_S1_E2 Жыл бұрын
Yea they realy do
@bubert8955
@bubert8955 Жыл бұрын
thats because they are straight cut gears
@whatthefunction9140
@whatthefunction9140 Жыл бұрын
I like it when it spins fast That's the best part
@AstonishingStudios
@AstonishingStudios Жыл бұрын
I was not ready for, but appreciated, the ASMR @ 5:11
@jamesgates1074
@jamesgates1074 Жыл бұрын
I'm surprised that the last gear held together at that speed. Most of my prints seem to break as soon as hit with even moderate violence.
@fireballyt3676
@fireballyt3676 Жыл бұрын
Skill issu- you know what? Sleep tight don't let the bed bugs bite, gn bro
@adicreeperman2965
@adicreeperman2965 Жыл бұрын
5:12 Now That is ASMR
@Kurogane_Hikaru
@Kurogane_Hikaru Жыл бұрын
This is awesome, i love gears and their mechanics so much that i even thought of making a GOOGOL spin with some fictional/indestructible materials and a huge engine, with a big fan on the fastest gear
@sureshsuthar2136
@sureshsuthar2136 Жыл бұрын
Well you should check out videos of Lego's, with lots and lots of gears.
@Edwardify
@Edwardify Жыл бұрын
I'd love to have a fan blade connected at the end. Would make an excellent hand cranked fan
@theegod9649
@theegod9649 Жыл бұрын
What about razor blades to cut cucumbers
@Edwardify
@Edwardify Жыл бұрын
@@theegod9649 sounds like something from a saw film
@theegod9649
@theegod9649 Жыл бұрын
@@Edwardify exactly
@AJ-vs3yz
@AJ-vs3yz Жыл бұрын
@@theegod9649 wouldn't work, the gear spins fast but it should stop with incredibly little force
@zippythinginvention
@zippythinginvention Жыл бұрын
I've had a curiosity for a long time: how to extract energy from something that's very heavy, but moving very slowly. I present the challenge to you: how much energy can you extract from a falling weight? Or, how long can you keep a system moving, while only dropping a weight a short distance? Ultimately, the scenario that fascinates me most is glaciers. It would seem there's a very large amount of potential energy there.
@SjaakWWortel
@SjaakWWortel Жыл бұрын
Wait until the glaciers melt and build a hydroelectric generator/dam
@zippythinginvention
@zippythinginvention Жыл бұрын
@@SjaakWWortel haha
@monad_tcp
@monad_tcp Жыл бұрын
While you are there, wait for the tundra to melt, now you increased the arable land 4000% near the artic.
@monad_tcp
@monad_tcp Жыл бұрын
You also get more wind power as a side effect, perhaps even too much of it, as more energy is freed into the system, a couple of tornadoes here and there, not big of a deal. And your coastal lines might change by a couple of meters. That's a minor deal thou, who would build anything on beaches anyway. Lots of erosion already.
@devinwalton408
@devinwalton408 Жыл бұрын
To your first inquiry, I present to you, the mechanical battery….
@andreweliason713
@andreweliason713 Жыл бұрын
I've just watched for the first time. The first thing that came to mind was, "Wow, he could make a wonderful siren!" I sure would love to have you take me up on my suggestion. Not sure how your neighbors will feel about it though 🤯
@JamesTDG
@JamesTDG Жыл бұрын
Can't wait to see the next iteration, I want this baby to be clocking at near light speed when you are done with this
@paulgoodrich1592
@paulgoodrich1592 15 күн бұрын
Handy little trick I’ve learned working with Gears and Gear cases. Take the end of your sandpaper and tape it to a drill bit. Wrap the sandpaper around the drillbit and now you have a rotary sanding tool.
@swarnendubera0129
@swarnendubera0129 Жыл бұрын
you can add a worm gear for rotating the slowest or the main driver gear as it needs more force to rotate other gears
@JoachimVampire
@JoachimVampire Жыл бұрын
i've heard that 3d printer worm gears are terribad. but again, i have no clue about what i'm talking about so..
@swarnendubera0129
@swarnendubera0129 Жыл бұрын
@@JoachimVampire he can add small metal worm gear , actually my perspective is , as worm gears have to much load capacity ans speeed reduction we have to give less force with hand so there will be less chance of breaking of gears
@rockyrodriguez2351
@rockyrodriguez2351 2 ай бұрын
I really enjoy it and laugh at the same especially during the breakage, oh boy you don’t have any idea how envy I am for such skill you have, keep doing more video, I’m your subscriber now.
@BB-km5nv
@BB-km5nv Жыл бұрын
How many hours you need until you finished your project
@BrianBoniMakes
@BrianBoniMakes Жыл бұрын
Have you done a cycloidal drive gearbox? I've seen them do over 20:1 in a single stage.
@chickey333
@chickey333 Жыл бұрын
Wow. This guy's patience knows no bounds. My patience knows almost no existence.
@lilmike2710
@lilmike2710 Жыл бұрын
Young man, there are people who frequent the salt flats trying to break the land speed record who would greatly benefit and appreciate a team member like yourself.
@mike3667
@mike3667 Жыл бұрын
Why?
@lilmike2710
@lilmike2710 Жыл бұрын
@@mike3667 why?? Why is the sky blue? Why does the 3:92 posi-track on a 68 Hemi Cuda work? *It just does* 😁
@scotsman9755
@scotsman9755 Жыл бұрын
Well done bro you should be really proud of yourself
@Nckolas20
@Nckolas20 Жыл бұрын
4:00 Definitely one of those "measures twice" moments
@ethanphillips8989
@ethanphillips8989 Жыл бұрын
I recommend using a impact drill or 3d print an adapter to hook the gear box to your lugs on your car for max power
@mikelove3943
@mikelove3943 Жыл бұрын
Did you seriously just suggest to make plastic battery cable clamps?
@__-fm5qv
@__-fm5qv Жыл бұрын
that 3D printing ASMR tho when taking the handle off the bed
@MrAnonymous283
@MrAnonymous283 Жыл бұрын
You are just like me, whenever i do any work after doing all the work i remember i missed a small thing or made a small mistake because of which i have to do all the work again.
@memeAlexcheramie
@memeAlexcheramie Жыл бұрын
This man took overdrive to a whole other level
@ChronicNOTAG
@ChronicNOTAG Жыл бұрын
God, I love watching things go fast.
@greg77389
@greg77389 Жыл бұрын
Watch your sex tape then
@victorpowell8154
@victorpowell8154 Жыл бұрын
Sounded like the school bus, brought back some good memories
@cesaresaladandthespicycrou4080
@cesaresaladandthespicycrou4080 Жыл бұрын
Use cutting oil and low RPMs with a lot of pressure while drilling metal.
@ghostbirdlary
@ghostbirdlary Жыл бұрын
you should try with the 3d printing material that has metal powder in it and you put it in a furnace and it turns solid metal to make some crazy fast ones that dont break
@NorthRoyalton
@NorthRoyalton Жыл бұрын
Great video
@mollykimball7261
@mollykimball7261 Жыл бұрын
It’s so satisfying
@ubecheesepandesal
@ubecheesepandesal Жыл бұрын
bro i swear ur channel will blow up soon!!
@user-cs1ne8gx9u
@user-cs1ne8gx9u Жыл бұрын
Friction drive would of course add friction but reduce the need for tolerance . Maybe be worth a try.
@halifaxlithos2488
@halifaxlithos2488 Жыл бұрын
Easily one of the most interesting and satisfying videos I've seen. Now I'm really interested in gears, and mechanical interactions. Where would I go to gain a greater understanding of the principals at work here? Please don't bother suggesting any college courses, I have neither the time nor money for that. I'm only interested in the knowledge, not the degree. Oh, and thank you for this. Awesome work!
@ianblanchet5500
@ianblanchet5500 Жыл бұрын
Buy a Machinery's Handbook and read the gear section, no better learning than on there
@BlazoSTRIKER
@BlazoSTRIKER Жыл бұрын
#6:30 bus engine sound (also please add a bearing or maybe lubricant oil or a transmission fluid for better results).
@blipzero
@blipzero Жыл бұрын
you should make a wimhurst with your 3d prints and see how fast you make the energy spark ? i think if you use the gears it will make the energy higher .
@conorstewart2214
@conorstewart2214 Жыл бұрын
Why not try helical or herringbone gears, they would have a more consistent transfer of power. Also what did you use to lubricate them? With the high speeds of the last few gears the lubricant may just get flung off.
@prich0382
@prich0382 Жыл бұрын
You'd need 2, one in the opposite direction because of the angle is also trying to move it sideways
@conorstewart2214
@conorstewart2214 Жыл бұрын
@@prich0382 That's what a herringbone gear is.
@MalcolmCooks
@MalcolmCooks Жыл бұрын
look into the gearboxes used for hand-cranked sirens
@Tobi-hs9pt
@Tobi-hs9pt Жыл бұрын
Idk why but the the gearbox is so amazing
@buuntaa1986
@buuntaa1986 Жыл бұрын
What are you using to help adhesion to the plate?? What settings did you use to get such a high quality print??
@RetroDotTube
@RetroDotTube Жыл бұрын
Yes I agree, I have to use a raft every time!
@hugs4drugs205
@hugs4drugs205 Жыл бұрын
Youve basically achieved the same engineering capacity as spinlaunch without spending millions
@tru_710
@tru_710 Жыл бұрын
Besides the actual gearbox being made, I'm interested in knowing how much all the machinery and tools used cost as well as the cost of materials and electricity, for just this one gearbox. Also, does that 3d printer allow for different levels of hardness or flexibility with the shapes it prints?
@MADEIN3DPRINTING
@MADEIN3DPRINTING Жыл бұрын
This looks really cool,. what was the material used to print this?
@lonely_toaster3517
@lonely_toaster3517 Жыл бұрын
Material
@elishmittywerminghanjensen1264
@elishmittywerminghanjensen1264 Жыл бұрын
Omg, the sword at the end was a welcome surprise 😂
@Pseudothink
@Pseudothink Жыл бұрын
7:58: That's no sword... It's a space station.
@elishmittywerminghanjensen1264
@elishmittywerminghanjensen1264 Жыл бұрын
@@Pseudothink It's too big to be a space station
@ZergrushEddie
@ZergrushEddie Жыл бұрын
0:18 That is a very pleasing sound
@MAS68saxophone
@MAS68saxophone Жыл бұрын
It might use more PLA/ABS but if you print the parts at a 45° angle against the bed they become much stronger!
@Idontrememberasking
@Idontrememberasking Жыл бұрын
Some bearings and some spacers could make a significant difference in friction
@StingerPhilip
@StingerPhilip Жыл бұрын
Certain components imo are just simply made easier and faster out of different materials, for example: the handle and base can be made from wood with handtools. Also after initial prototyping, gears can be made from by the aid of fixtures and woodworking jigs. See Mattias Wandel's channel.
@fabrica8588
@fabrica8588 Жыл бұрын
making the handle and base from hand tools would take hours for someone who most likely doesn't know how + gears can be made out of other materials in 3d printing and it is most likely quicker to 3d print
@gavmansworkshop5624
@gavmansworkshop5624 Жыл бұрын
As you gain momentum shift into the next one like a manual transmission.
@robertkesselring
@robertkesselring Жыл бұрын
Have you thought about making a compound planetary gearbox?
@marlonjareck7367
@marlonjareck7367 Жыл бұрын
printed in PLA or PETG and what did you use for build plate adhesion? Glue?
@briananeuraysem3321
@briananeuraysem3321 Жыл бұрын
This whole thing sounds almost exactly like a diesel truck
@anterprites
@anterprites Жыл бұрын
How about making input a gearbox like in a car, so you don't need to apply a lot of force to start that thing and change ratio gradually.
@adamcusick1514
@adamcusick1514 Жыл бұрын
Great video. One tip, get some cutting oil and use it when drilling metal. You'll spin the drill slower but it will cut faster and cooler. When it's cooler it'll wear your bits less and cut the metal smoother. If you get it and don't agree I will pay you the $10 for the oil. No joke.
@ktwisdom1547
@ktwisdom1547 Жыл бұрын
I would love to see a tuktuk peddle powered with 3d printed gears, that also transfers the energy to a battery! 🤔
@lilmike2710
@lilmike2710 Жыл бұрын
Would not result in anything extraordinary or unpresidented. The laws of physics will not be broken or mocked.
@Godzilla20191
@Godzilla20191 Жыл бұрын
When the gear box spins so fast that it sounds like a PS4 cooling down
@bb21again.67
@bb21again.67 Жыл бұрын
In the early 1980's a New Zealander was watching a coin spinning on its edge but face down until it eventually fell flat and stopped. He consulted a mathematician and an engineer who together designed a reduction gearbox that had enough torque to dislodge a house from its foundation. Are you familiar with it? because as like "Epilogics" infinitely variable transmission that supposedly could handle large torque loadings both seem to have disappeared.
@Angry_Farmerz
@Angry_Farmerz Жыл бұрын
if this dude built a house and it failed he would instantly start making it stronger and building it again
@newbieyt1100
@newbieyt1100 Жыл бұрын
Imagine adding a little generator at the end
@chinabluewho
@chinabluewho Жыл бұрын
Crimony time is going by fast as I grow older , I saw the dat e Aug 10 on the video and thought it was from last year and took me a few seconds to realize that it is not only not July anymore it is not even August .
@jacksoncolefitekarmel6281
@jacksoncolefitekarmel6281 Жыл бұрын
Imagine if this was on a bicycle!😮
@yash_kambli
@yash_kambli Жыл бұрын
I think u should use ball bearings and herringbone gears.
@demonking62gd69
@demonking62gd69 Жыл бұрын
A cool idea would be to make and adapter of some sort so you can put and impact on there
@sgthop
@sgthop Жыл бұрын
An impact would be a bad idea, the hammer strikes would likely break the gears.
@timothyweed7474
@timothyweed7474 Жыл бұрын
Could the last gear be attached to a trolling propeller? Crank power trolling motor
@theplayer12312
@theplayer12312 Жыл бұрын
6:33 straight-piped G36 at 4am:
@mrllamaton1873
@mrllamaton1873 Жыл бұрын
Use a berring on the handle so it has less friction on the hand
@noconz0727
@noconz0727 Жыл бұрын
Using a hand drill on a drill press, classic
@nicholaschavez9204
@nicholaschavez9204 Жыл бұрын
You should spin the handle and see how long it takes for the last gear to stop spinning
@aBold12346
@aBold12346 Жыл бұрын
Good job to you
@jeffreykirkley6475
@jeffreykirkley6475 Жыл бұрын
Honestly, I'm just waiting for someone to go super sonic with gear ratios.
@lloydfox5752
@lloydfox5752 Жыл бұрын
Probably save some frustration by getting a screwdriver bit extension.
@philipmiguelponciano8604
@philipmiguelponciano8604 Жыл бұрын
could use this to make a fan
@ultranitro437
@ultranitro437 Жыл бұрын
3D printers are like the gateway for people with absolutely no mechanical knowledge to build something.
@Audi_Sport_Quattro_S1_E2
@Audi_Sport_Quattro_S1_E2 Жыл бұрын
Emagine this being a gear box in a car lol that would go SOOO FAST XD
@hanslamdoen6184
@hanslamdoen6184 Жыл бұрын
Yea lol , but you would need a VERY big engine .
@princejohnbulalagje4662
@princejohnbulalagje4662 Жыл бұрын
Cant that be used to power up stuff? I don’t know that much about how you make power (eco friendly way) but that seems like a good way to get electricity
@exitusthirteen
@exitusthirteen Жыл бұрын
No, because he is putting in high torque at low speed and the last wheel could only put out low torque at high speed. So the amount of energy would be the same (minus friction). This construction is only a gearbox. Typically it is used to transfer the mechanical energy from an turbine to a generator, which will convert the mechanical energy to electricity.
@mynintendogamingfeed5208
@mynintendogamingfeed5208 Жыл бұрын
6:30 more like a V6 engine revving to the Red Line!
@plague49.
@plague49. Жыл бұрын
Very satysfain
@CubiCNooBiC
@CubiCNooBiC Жыл бұрын
You own 3d printer filament factory? also is there a reason why you dont simply use bicycle crank arm to spin it?
@ricksanchez56
@ricksanchez56 Жыл бұрын
man that build must of been really stressful lol
@soda415.5
@soda415.5 Жыл бұрын
Basically Truck/Bus sound generator.
@user-jd4be8si6f
@user-jd4be8si6f Жыл бұрын
Have you tried attaching a load to one side, and a generator to the other, for example, so that the load drops in 24 hours providing electricity? make a semblance of a gravitational power plant?
@barrybee4610
@barrybee4610 Жыл бұрын
Make a gearbox where the first gear spins at the same speed as the last gear
@Randomshitposter69
@Randomshitposter69 Жыл бұрын
Nice
@N0Xa880iUL
@N0Xa880iUL Жыл бұрын
Sounds like a state transport bus
@EnjoyCocaColaLight
@EnjoyCocaColaLight Жыл бұрын
So. Enough gear ratio that a dropped weight of a few tonnes, pulling a chain, will cause a serious amount of power generated (think power plant), and when at the bottom - disconnect gears while pulling the weight back up, re-clutch the gears, and let gravity power the power plant once more. Do this with enough gears and you literally have perpetual motion.
@GLabs2523
@GLabs2523 Жыл бұрын
What CAD software do you use?
@gigachad6863
@gigachad6863 Жыл бұрын
His Neighbours be like: OI SHUT UP MATE OUR EARS BURN
@trk.is.trippin
@trk.is.trippin Жыл бұрын
ma man is studying gears 💀
@COYO-T
@COYO-T Жыл бұрын
Would like to see you make it more practical like hooking it up to a generator and seeing what rate you could charge something.
@oscarcarter9981
@oscarcarter9981 Жыл бұрын
Unfortunately physics means that the gearbox can't output any more power than what you crank it with - gears don't give you free energy, they just allow different trade-offs between speed and torque, with the output power being the same as the input power (assuming 100% efficiency), and thus if you expended the same energy just cranking the generator directly as you did through the gearbox, it would charge at the same rate.
@KClO3
@KClO3 Жыл бұрын
@@oscarcarter9981 yes and generators are more efficient the faster they spin.
@amamasclips_offical
@amamasclips_offical Жыл бұрын
5:51 sounds like a primary school school bus engine noise from hong kong
@yanncarfantan3250
@yanncarfantan3250 Жыл бұрын
Bro it's been 2years your are doing this and you don't leanr from errors, like seriously...
@Kubla84
@Kubla84 Жыл бұрын
you need bearings and solid gears, your spoked gears are causing significant air resistance
@ghostlyninja125
@ghostlyninja125 Жыл бұрын
Id see if a worm gear would help with spinning the handle
@maximilianniedernhauser1950
@maximilianniedernhauser1950 Жыл бұрын
you should raise the module (teethhight) cause of slip also you should never use less than 17 teeth and avoid equal deviders
@crankhandle
@crankhandle Жыл бұрын
The high speed gear would be better having covers each side to reduce aero drag
@jollyd507
@jollyd507 Жыл бұрын
1:45 smaller holes are easier to fix, because I can precisesly drill them out :skullemoji::skullemoji::skullemoji:
@bunnygetspancake6916
@bunnygetspancake6916 Жыл бұрын
💀
@richardwolf7696
@richardwolf7696 Жыл бұрын
Mayeb for the handle use a breaker bar and try to connect that
60 speed manual transmission
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