Made this to space an Ikea Karlby top 50mm away from a wall for cable management. It keeps the top from getting pushed against the wall, potentially damaging wires. It just slips on, then the top can be pushed back against the wall with these trapped in between creating a gap.
If you print in the orientation shown in the video below, it needs at least 20% infill, but it will allow you to adjust the ‘gap ’ the spacer creates by only printing what you need for your purpose.
The author marked this model as their own original creation.