Simple bracket sized for 3M Command Picture Hanging Strips. I've designed the for holding an LED strip under my bed, which had some 3M self-adhesive back side, but didn't hold strongly enough. Due to the nature of the 3M strips I can now also remove them again, if needed.

I recommend printing them with transparent filament so that they're almost invisible.

You can find those strips e.g. here: https://www.amazon.de/Command-17202-3M-Bilder-Montagestreifen-klein/dp/B00016ZLDY or here: https://www.amazon.com/Command-Picture-Hanging-Strips-8-Strips/dp/B00SFWNAFC/ref=sr_1_5?ie=UTF8&qid=1477825169&sr=8-5&keywords=command+picture+hanging+strips