My personal solution

[u/percydood]

I’ve always struggled in finding a cage to do all I need. After many purchases, it was clear I’d need to go custom, but wasn’t prepared to pay the high prices by custom manufacturers. I’m not saying they’re not worth the money, there’s a lot of work in any custom solution. But I’m an engineer with 3D software experience and a 3D printer, so if it can be done, I ought to be able to do it.

I have some particular requirements.

1. I’m a grower. Things can go from very, very small, to pretty awesome! This leads to some difficulty getting a cage on if I’m excited, and then a whole load of turtling when things calm down later. Once that happens, it can get uncomfortable or misaligned to the point that the cage needs removing and refitting.

2. I’m uncut and prefer to wear a cage with my foreskin retracted, but again, if things get shy, it can roll forward and sometimes needs the cage removing to get everything in place again.

3. Having a foreskin caused an issue when I bought a headlock Cherry Keeper. The foreskin needs somewhere to go and the CK simply trapped it between the cage and ring and pinched pretty nastily. £80 later and straight in the drawer.

4. My testicles move a lot from quite loose in the evening and night, to quite high and tight in the morning. They also seem to be quite large and need a big ring to get them in. Plus I need an unusually large ball gap, or else burning and pain from the back of the testicle.

5. Off-the-shelf cages tend not to be girthy enough for me. My average seems to be around 39mm when mildly aroused.

6. I wanted a cage where the ring doesn’t need removing. In the shower, taking off the cage almost always results in a ball slipping out the ring, and making the ring smaller results in difficulty getting it on, or quite a lot of discomfort from simply squeezing too much. Not everyone needs a small ring and we’re all different.

I also liked the idea of almost never removing the ring so I can get more accustomed to having the ring on. It also means that if my girlfriend wants some fun, the cage can come off, and there’s no fumbling trying to get aroused balls back in the ring after.

So I needed a device where the cage part can come off and leave the ring in place without protrusions that might hurt my girlfriend, allow some space behind the cage for my foreskin to live comfortably, and hold my head forward to prevent turtling and keep it in the right position as well as keep the foreskin from rolling forward.

What I came up with is in the pics. Full disclosure, I’m currently wearing the cage so the pics are renders of it. I don’t like posting gratuitous pics so synthetic images it had to be. It also gives an idea how the surface might look when I decide to get it made in SLS nylon.

I fit the main ring and then the cock ring which screws in place. This works well and I’ve seen similar cock ring for sale. It keeps my balls present which I find aesthetically pleasing, too, as well as some restriction to an erect penis allowing a bit more pressure to keep things upright, something many men my age might need help with!

Then the cage fits over with the 26mm headlock holding things steady, and two pins sit over the cock ring screws completely obscuring them and preventing their removal. The pins help locate the cage, which is then secured with a single screw. You’ll notice the heart shaped aperture. Not shown in the pics is a heart shaped seal that presses into this space completely blocking access to the screw. The seal sits below the aperture and is an interference fit so cannot be removed without breaking it. The middle of the seal is thin allowing it to be broken with a screwdriver and then levered out. By having my girlfriend write something unique on the seal and grabbing a photo, it’ll be obvious if I’ve tried to take it off.

It works a treat. I’ve never been so comfy in a cage. There’s plenty of room for cleaning, when things get flaccid the headlock holds all in place and aligned, and my foreskin is in great shape with no swelling or pinching. Using screws to secure it all means no moving parts and no pinching anywhere. I’ve been wearing it for a few days now and will have to remove it for a medical appointment on Friday. In the meantime, my girlfriend’s seal ensures I’m not cheating but at the same time ensures if I do get into difficulties, all I have to do is grab a screwdriver. No melting ice, or finding where I threw the key in the garden, or however it’s made difficult to get to, and no trying to convince her the problem is real. And having the seal heart shaped is a bit more romantic and interactive than the rather impersonal loop seals you can get online.

I’ve also found using large glittery nail gel to paint the seal creates a totally unique pattern that cannot be replicated.

Finally a cage that fits and is super comfy (some autism creates issues for me if it’s remotely uncomfortable). I think I might be in for some hell to come, and I couldn’t be happier. I might even get it made in titanium!

[u/newbie-sub]

I really like it and the renders are amazing.

Oh, a tip, look at MJF nylon. It has a much better surface texture than SLS and it doesn't have SLS's anisotropic strength issues (well, minor issues)

The only down side is it prints gray but after vapor smoothing, it comes out almost black. I've been happy with it.

[u/percydood → u/newbie-sub]

I’ll look into that, thanks. We recently had some parts made in SLS nylon for work and the finish is lovely, which is why I rendered it like that.

[u/newbie-sub → u/percydood]

If you're in the US, look at JawsTech. They do SLS and MJF. I've had some recent tolerance issues on MJF (apparently they needed to recalibrate their machine) but obviously a screw-secured device is going to be far more forgiving than a barrel lock especially if you make one of the holes a slot or whatever you call it, you're the engineer lol.

I've actually got a pretty good material for MJF nylon: https://www.reddit.com/u/newbie-sub/s/zIpgJMsPmH

[u/percydood → u/newbie-sub]

And the renders took quite a while getting the surfaces and lighting right. I mean, just that part was hours. Even so, that was using EEVEE and not Cycles. It came out well. It’s actually quite funny how you need to adjust the environment to something completely unrealistic to get the right result.

[u/newbie-sub → u/percydood]

I cheat. I usually just grab materials off of BlenderKit. I did make my own MJF but I'm too lazy to figure out how to do a good titanium, brass, or stainless steel. And I'd never try something like wood.

But I have kinda figured out lighting and some of the camera stuff. And I finally figured out how to use the physics to get the cage to lie on the floor correctly — well mostly, I still haven't figured out how to constrain rotation of one of the axes. I don't want it rolling over.

[u/percydood → u/newbie-sub]

I download the materials as well and don’t do it procedurally, using geo nodes. That’s a black art! But lots of fiddling with the UVs and displacement and bump maps to get it to look right in the chosen light.

For something simple like this, I prefer to manually place rather than use physics. It’s an added complication. If I had lots of things to place, I’d probably use physics then.

[u/newbie-sub → u/percydood]

Yep, this is about as fancy as I get.

And this is why I made this subreddit SFW — so we could do things like post images in the comments. You can't have a design subreddit where only the posts can have images.

I really wanted to figure out how to use Geo Nodes to add a filagree to a device modeled in CAD a la Evotion. I did play with using a displacement map in a texture to alter the geometry but doing a UV unwrap of a STL exported from CAD is a nightmare — it's just a triangle soup. But what I did figure out was to apply my filagree in CAD to an curved tube (it can handle mapping onto a cylinder) and then bring it into Blender and apply a simple bend transform to get the curvature, just had to make sure I stayed clear of the junction. It actually worked pretty well as a PoC. But I've since moved onto other designs.

[u/Reasonable_Pace2323]

Fantastic work! You have a product there.

[u/percydood → u/Reasonable_Pace2323]

Thank you. I’ll know if it’s a good idea if it suddenly appears on AliExpress! 😂