I created this quick spacer because although my A1 was positioned on a stable surface, after a few hours of work, I noticed that the bed cable was starting to touch the wall. This spacer indicates the minimum distance that the back of the printer must have from the wall for the cable to be safe. You can use it quickly to check the distance or fix it to the wall (maybe put two opposing pieces), with a rubber cap on the front and place the printer. So you are sure that the bed cable will always be safe.

With the red marks you can also make quick measurements, the small ones indicate 5mm pitch, the large ones 10mm.