IKEA Ribba frame tabletop stand for 21 x 30 cm
A pair of feet that lets a wall-only IKEA Ribba frame stand on a desk or shelf, since Ribba frames come without a back easel. The Ribba profile is about 45 mm deep, so each foot has a 46 mm slot with a 0.5 mm clearance and a 2 mm rubber pad recess, tilting the frame back 8 degrees. The feet are 80 mm long and 30 mm wide with a 4 mm floor, weighted with a pocket for a 20 mm steel washer so a 21 by 30 cm frame cannot tip. Print them flat, slot up; a pair takes under an hour.
Ribba comes in several depths and sizes, and a downloaded stand for one frame size will let a larger frame topple. In SpeakCAD you give the frame size and profile depth, preview the feet in the browser at no cost, ask for a single wide foot for a 50 by 70 cm frame in the chat and download the STL.
Design a pair of frame feet each 80 mm long, 30 mm wide and 25 mm tall with a 46 mm slot 12 mm deep tilted back 8 degrees for an IKEA Ribba frame 45 mm deep, a 4 mm floor, a 20 mm washer pocket underneath and a 2 mm rubber pad recess in the slot.