Book stand for IVAR shelf

This book stand shall prevent books from falling sideways from an IKEA IVAR shelf. It can be squeezed into the side parts of IVAR. I printed in PETG, flat on the print bed, 3 pieces at a time. 30% infill, support overhang angle 75°, with brim. A nice alternative is also https://www.thingiverse.com/thing:3305547 .