This design was meant to be compatible (enough) with the 30x15mm cable duct management that is sold by the Swedish retailer Jula.
My solution of the corner/junction parts are that the base duct has some limiting tabs which the original do not have
so you cannot insert the base duct longer than needed.

* Update 2026 (January 2:nd) *

- Added fillets on the tabs to make them a little bit more sturdy..

The Duct itself :
[https://www.jula.se/catalog/el-och-belysning/elinstallation/kabelinstallation/kabelkanaler/kabelkanal-409065/](https://www.jula.se/catalog/el-och-belysning/elinstallation/kabelinstallation/kabelkanaler/kabelkanal-409065/)

The corner/T-junction bits for the duct :
[https://www.jula.se/catalog/el-och-belysning/elinstallation/kabelinstallation/kabelkanaler/vinkelset-409073/](https://www.jula.se/catalog/el-och-belysning/elinstallation/kabelinstallation/kabelkanaler/vinkelset-409073/)

Plate 1 : Pieces for Corner, T-junction, Straight, Fourway, Endcap, S-Shaped covers, inner and outercorner, one base cable duct (50 mm) and one snap on lid for the duct.

Plate 2 : One base cable duct (300 mm) with 4,5 mm mounting holes

Plate 3 : One snap on lid for the duct (300 mm)

Support is only needed (on my printer at least) on the corner/junction parts on the overhanging lips from the pieces themself.
Here I'm using tree support and only towards the build plate.