I live in a tenement stair in Marchmont where there's rarely any space to securely lock up my bike. So I've designed and 3D printed some hooks which clasp onto any banister pole between 20mm-30mm diameter and support any bike up to 20kg by the saddle rails. I've been using it for over a year and it's been great! It means that my bike is close enough to the stair to use a U-lock on the frame+back wheel and another on the front wheel (I've had just my front wheel stolen before >:( ) without needing to muck around with a cable lock.
Was wondering if anyone else who struggles to find a good place to lock up their bike would like one? I'm selling them for £10+postage. I've made a website with some more photos and information here stairhook.com.
They're 3D printed in ABS then submerged in an acetone vapour bath to add gloss and strength. They're are supplied with the required rubber for grip and nuts and bolts.