Custom Clamp for Architect/Swing Arm Lamp

I bought this Lamp off eBay but it only came with a bad plastic clamp which I couldn't clamp to my desk because the sides of the desk are too thick so I made this custom "clamp" that attaches to my bedframe right next to my desk. The part of the bed frame that the clamp is attached to is 21mm wide so if you want to print this to clamp onto something with a different width made sure to change that.