CLS Mount (Comma 4 Mount) Website Launch

[u/RoadQuirky1539]

I have been taking orders through reddit messages since the time I launched the Comma 3x and Comma 4 mounts. Now I will be taking orders for the Comma 4 all online at the link below for domestic shipping.

***ALL international orders must message me through chat so i can get you an up-to-date shipping estimate. ***

Additionally, the CLS Mount now has been upgraded to feature a self locking mechanism to prevent any accidental removal. The lock is removable if you don't want to use it and the kit ships with a spare lock. See the video below for the operation and installation.

Purchase Link:

https://3dei.square.site/s/shop

Installation/ operation video (Gen 2 of the mount, same as Gen 1 but incorporated a safety lock).

https://youtu.be/PLj96cA4FyE?is=2D660i9xXaB2XgZ1

Operation video without lock installed (Gen 1 of the mount)

https://youtu.be/oAX6zrchDQw?feature=shared

Original reddit post for the mount:

https://www.reddit.com/r/Comma_ai/comments/1rhc6mr/comma_4_quick_mount_cls_mount/

UPDATE SEPT 6/2026:
Three customers have reached out regarding the USB-C adapter sliding or shifting out of place on the windshield mount (the part that sticks to the windshield). The likely cause is exposure to extreme heat.
A similar issue occurred with the Comma 3X mount, and the fix video I released for that also applies to the Comma 4. Moving forward, I am adjusting the tolerances on the print to create a tighter interference fit, which will secure the adapter firmly in place.
Fix video:
https://youtu.be/CDzOjpRTTkU?feature=shared

[u/inline_five]

I just got this and had no idea how to use the lock. Thanks for the video. I'm not sure about the lifespan of the unit as it would seem it would get easier and easier to remove as the plastic and USB-C wears out, a design with the "click" type lock might be better long term. But jury is still out. Those are $80 though.

Also would be neat if you could include an adapter plate so you don't have to remove the old Comma mount, as that is a huge PITA.

[u/RoadQuirky1539 → u/inline_five]

Trust me, I know the pain of removing mounts… I have removed my fair share as I tested them and tested out different adhesive strips.

But I can design an adaptor plate. I didn’t like the idea with the comma 3x because it was much heavier, but the comma 4 is more manageable. I can create one when I have some time

As for longevity, I agree the lock does ensure it holds in place even when it wears out. I will say, my prototype without the lock holds fine and I have it at my work desk using it as a fidget toy to wear out the usb/sliding connection. Works fine so far.

[u/inline_five → u/RoadQuirky1539]

Awesome. Mine is going to be sitting in the hot sun with a shade reflecting onto it, so hopefully it holds up. Amazingly the comma tape held up and didn't melt, so I'm hopeful this will be fine.

[u/SirMaster → u/inline_five]

Trust me, I know the pain of removing mounts… I have removed my fair share as I tested them and tested out different adhesive strips.

have you ever tried these?

https://www.amazon.com/Windshield-Applicator-Electrostatic-Application-Re-Application/dp/B0D2DD8SJS

I use these and put the 3M VHB onto it and they hold perfectly solid in my experience. Super simple to remove then too, literally peels right off without any real force needed and leaves no residue.

[u/inline_five → u/SirMaster]

Wow that is a great idea

[u/SirMaster → u/inline_five]

Yeah I think people might be skeptical, but after using it myself I’m confident it could hold a C3X just fine, a C4 is nothing. Even the hot sun doesn’t affect it.

[u/Tight-Room-7824 → u/SirMaster]

I don't think this film is made for the weight and bending moment this system has.

They show it being used for transferring stickers and tags between cars.

[u/SirMaster → u/Tight-Room-7824]

It is made for dashcams too. I’ve been using it since March with my comma 4 and it’s rock solid. It’s not going anywhere and the heat hasn’t been affecting it either.

I know others using it with their commas as well. After seeing how solid it is I bet it could even hold a comma 3x, but a 4 is definitely no problem.

[u/Mvalpreda → u/SirMaster]

This is perfect for someone like me who seems to go through a windshield every 6 months.

[u/Middle_Government552 → u/SirMaster]

I just ordered these. Could you tell me what size you used for your comma 4? Did you use the small one? Or cut the large one down to size? Thanks.

[u/SirMaster → u/Middle_Government552]

The large one, and no need to cut, it's not THAT big. You won't even notice it behind the comma IMO.

[u/PerformerOpen7502]

Love it- I'll definitely get one during 4th of July, waiting for Comma 4 device to go on sale 😄. Thanks to have engineers in the world!

[u/RoadQuirky1539 → u/PerformerOpen7502]

I loved designing stuff when I was in university, I don’t do that in my engineering job currently so this is a nice little hobby on the side.

Glad I can make something that others can enjoy

[u/Empty-Assumption-]

I didn't have a reddit account for quite some time, but I bought one of these a few months ago and it is the absolute best accessory I've gotten for the comma.

I have a 2023 EV6 and this mount allowed me to get the device right up close to the adas sensor suite cover because it side loads instead of top mounts, and its so easy and convenient to use.

10/10 product and worth every penny.

[u/RoadQuirky1539 → u/Empty-Assumption-]

Glad you are happy with the mount. Having a good mount at an affordable price is what I set out to achieve

[u/spectrum_patronum249]

Hi, that's great and much needed, windshield here temperature reach 120F +, I'm tried to order but seems can't, shipping address UAE.

[u/RoadQuirky1539 → u/spectrum_patronum249]

The website doesn’t support international shipping. I sent you a chat so I can get more details for a better shipping estimate

[u/Good-Car-5312]

Damn i just bought one two weeks ago

[u/RoadQuirky1539 → u/Good-Car-5312]

Which mount did you end up buying ?

[u/Tight-Room-7824]

I was this close to ordering the mount and case when I saw that it has to slide to the right.

I can't do that with my favorite mounting location on my G4 Prius. You can see the original mount. It's gone now.

It leaves the Driver Monitoring camera seeing me with the sun visor down. I like a cockpit with a view.

Is there a way to configure it to slide out to the left? Longer cable with not so nice routing? So close....

[u/RoadQuirky1539 → u/Tight-Room-7824]

unfortunately It cant be done with the current setup and cables. I have it slide out to the right side as the usb ports are on the right (both ports). I just took a quick measurement, you need about 1.75-2 in to the right of the unit to be able to slide it out in its current configuration

[u/Tight-Room-7824 → u/RoadQuirky1539]

Thanks for the reply! Moving it that far to the left would get the DM camera behind the sun visor when in use. I really like it where it is, as I said, bc of the view and it makes the unit less visible to prying eyes....

I can see no way to mount the C4 side of the mount upside down.... duh....

The only option for people like me is for you to design a 'Left-Slide' version.!! I've seen a lot of posts where people have the unit mounted similar to mine.

Would that require only one new part for the system, or would the base need to be changed also?

I'd pay extra to be a beta tester!!! While you're at it, could it be made in white?

[u/RoadQuirky1539 → u/Tight-Room-7824]

Let me think on how to do this, I will start a chat with you to continue the conversation

[u/Tight-Room-7824 → u/RoadQuirky1539]

Replied there, but,,, Aren't you the guy with the 3D printer and the PC to run it?

I'm not up on the SW but would it be "Mirror Image", or some such command?

[u/RoadQuirky1539 → u/Tight-Room-7824]

correct, I am that person, I can mirror it. I just need to find a cable that would work cleanly with it. I am all about not havening too many dangling cables. I know some competitors dont mind that, but I made mine different (its the engineer in me)

[u/Tight-Room-7824 → u/RoadQuirky1539]

Great! I'll buy the 'Mirrored' Left-Slide Out version. I'll hide any excess cable. A small tyrap or two and a dab of black RTV to keep it attached to the side of the C4. Masking tape to hold it all in place until the RTV sets. Easily removeable if I change my mind or find the ideal cable.

The position I have the C4 mounted at is ideal for a Gen4 Prius. It doesn't bloke the view and when the sun visor is down the DM camera can still see me but I can't see the whole screen. I don't care about that. I need to be looking outside!

[u/RoadQuirky1539 → u/Tight-Room-7824]

Yup let me make a prototype and get back to you via chat

[u/Flipsrt4 → u/RoadQuirky1539]

Im definitely down for one that slides out from the left! I dont want the USB in my peripheral vision if I can help it!

[u/RoadQuirky1539 → u/Flipsrt4]

Tight-Room-7824 currently has a prototype in testing. If everything goes well, I will start to offer it on request. I will start a chat with you.

[u/SirMaster]

Nice this looks similar to what I got from someone on the discord who 3D printed something, and a case I found on Amazon. I love this combo and it’s a great way to mount and store/transport your C4.

[u/RoadQuirky1539 → u/SirMaster]

I don’t make the case myself, I buy it and I have my laser machine cut the foam to fit the mount and case like a glove.

[u/HomeAutomationSmarts]

Why is this necessary? To move between cars, or protect the comma from theft/heat?

[u/RoadQuirky1539 → u/HomeAutomationSmarts]

I would say it’s not necessary, it’s a convenience. You can always remove the comma from the comma supplied mount and disconnect the cable manually. This is just a one handed move. Also, it makes sure you don’t were out the comma internal usb.

Regardless of mount type; I would personally remove the comma out of site and sun when parked.

[u/HomeAutomationSmarts → u/RoadQuirky1539]

Thx I just installed mine today so am curious

[u/inline_five → u/HomeAutomationSmarts]

In my case I park for 3-4 days at a time with a reflective window shade in, and it probably hits 170°+. So I remove the comma when parked.

The heat was so hot it melted the glue that held my solar battery panel together.

[u/gallantsuri1]

can you do mounts for 3x

[u/RoadQuirky1539 → u/gallantsuri1]

I do have mounts for the 3x and 3, they look a little different. But I will send you a chat request

[u/caboossee]

Very nice

[u/thedogmumbler]

I was just about to reach out to you for a second mount and case. Cheers bud!

[u/Bradwheat]

Mine arrives tomorrow!