Automate an ikea blind

I have an IKEA roller blind that I wanted to automate. This is my (so far) final version and works really well. I'm not providing all the info, but what I don't supply is easy to work out.
Remove all the insides from the roll-up mechanism - its a long coiled spring about 35 cm long.
Print the parts (not the gearbox)
Glue the sleeve onto the motor (you will find it on eBay etc, I went for a 60rpm version, but there are other options - they are about £8 (UKP)
At the back of a sleeve, is a plac