IKEA RANARP rotating clamp shell

WARNING: I do not know the dimensions of the desk variant, I made this for the floor variant. Print it for the desk variant at your own peril. If it does fit, I would love to hear about it :)

My girlfriend had a RANARP floor lamp that stood in the sun in her apartment, and the black plastic in the clamping mechanism completely disintegrated. I don't know if the plastic was a bad batch or if the UV/heat shredded the polymers, but the lamp was basically useless without it, so I printed a replacement.  To install them, you will need to disassemble the light almost entirely: 

1. Print 2 of this item.
2. Loosen the brass nut through which the power cord enters the lampshade assembly, make sure you have a bit of slack on the power cord. Note: this was screwed in quite tightly for mine. I don't know if that is done in the factory, but you will probably need some kind of pliers to properly hold the nut while turning it. The pliers may damage the brasslike coating, so put some protective paper or something in between them if you want to prevent this.
3. With a small flathead screwdriver, pop open the bulb holder assembly
4. Unscrew the big plastic flathead screw holding the cord  in place
5. Stick a thin flathead screwdriver into the holes below the ones holding the power cables in each holder, with 2 pieces of metal alongside one another and a slit in between. Push relatively hard and you should be able to get the power cable out without ripping it out of its crimped connector (learned this the hard way).
6. Straighten out the ends of the power cord as much as possible. You will have to pull the cord through the whole upper arm of the lamp to install this, and push it back through when done, so the smoother the littler the hassle.
7. Once the cord is out of the upper arm, you should be able to just pull the whole arm out of the joint
8. If you hadn't already, remove the wing nut. Then, push on the threaded rod to get the center holder out
9. You should now just have the rubbery pieces and 2 small hard(ish) plastic tubes with  corners on one end (and maybe some remnants of the old clamp) remaining. Time to reassemble.
10. The rubbery pieces should fit nicely in the printed items, put them in the assembly after which you put in the central holder with the threaded rod through the side again. Don't tighten the nut yet.
11. Put the arm through the holder. Tighten the nut to check it has a good grip. If not, something is wrong and I don't know what. Would love to hear about it though
12. Put the power cord back through the upper arm. This can be a bit finnicky at the end. I just ripped out the little black plastic cover surrounding the hole, made it easier. If you have tweezers or some kind of small pliers it might help. Don't forget to squish the black plastic ring back onto the hole once done
13. Making sure to have the threaded side pointing toward the end of the cord, put the brass nut that holds the bulb holder in the shade over the cord (I forgot about this too  :D)
14. Get enough cable through it all so you can easily work on the bulb assembly
15. Put the cord through the upper bit of the bulb holding assembly, then through the plastic flathead screw holding strain relief, then plug the crimped metal pieces back into the holders. DO NOT PLUG THEM INTO THE SAME SIDE OF THE HOLDER, THAT WILL SHORT THEM
16. With the strain relief bit properly placed in the upper part of the assembly, push the 2 parts of the assembly together
17. Push the assembly through the hole of the shade and tighten its nut.
18. Hopefully, you're done! Pop in a bulb and make sure the light turns on, and gaze upon the majesty of a fully functioning RANARP

Through some screwup in the design, I didn't manage to fit in the little hard(ish) clear plastic sides that the tube goes through, and so far it doesn't seem to matter. If the print breaks because of it I will update the model to accommodate those pieces.