They would be pretty hard to print I think as they have a metal backing with the rubber bonded to it.
Impossible I'd say, I've just had aa look at my worst one. It actually seems to be a metal structure with a rubberised coating, so very strong.
BUT I think a solid, slightly flexible, 3D-printed ...

Positive response from the seller so I've ordered a pair. I'll look at using suitable stainless washers to reinforce the fixing.

The German eBay listing does clearly state (in German) that they are 3D printed and have no steel core; translation:
"Installation note: Please note that these components do not contain a steel core; therefore, they should be installed using lower torque settings. Some product images are 3D ...

Just reporting back, all seemed good on a few miles run yesterday evening, lots of nicely chilled air. :D
Next thing will be to check the condensate is actually dripping out onto the ground rather than quietly soaking into the carpet...... :oops:
(been there, done that, many times and there are no ...

Thanks MJ, I'd already checked Tradition.
There seem to be some for sale in Germany, not sure if they're genuine though: https://www.ebay.co.uk/itm/126314926325
Look 3D printed and no evidence of a backing plate.

Not sure what they're made of, some sort of polymer or rubber maybe?
Mine are looking awful, rock hard and cracked. Are replacements available or has anyone 3D-printed them?
The "brackets" they impact against on the body are still fairly OK, but both blocks on the boot lid are seemingly close to ...

Sadly no, I just saw someone in the "office" (shed outside) and paid. I recall that years ago at A8parts (Lindisfarne meet maybe?) they did it and got "not much" out and it was still vaguely working beforehand, unlike this time.

Just reporting back, had a "proper" drain and refill today, plus a dye leak test. £100 plus VAT which isn't bad. Seems OK but only time will tell.
Didn't seem as efficient as I remember, but it was only a short (1 mile) run home and the car had been sitting in full sun in 30c+ heat for quite a ...

Just to support what Ronin has described (I also mentioned the possibility of relays earlier) I've used relays quite a lot in my S8 to manage additional kit, though most of it has been removed now.

At one stage I had extra audio and video inputs (including XCarlink, digital TV and reversing camera ...

Compressor clutch is fine. Posted borescope snake via foglight aperture, secured with gaffer tape well away from pulley and belts!
Has a useful 90-degree mirror tip that I had attached; could clearly see some sort of label near the centre of the pulley.
Ignition on, A/C into Econ mode, start engine ...