photo calibration square

This square is used for taking pictures and having a scale reference. The square / cube is 20mm*20mm*5mm. If you take a picture from the top this allows for measuring of objects in the picture, since the cube is a known value to reference. Search online for ‘measure in photo online’ and many sites will give the free tools to use this calibration square. This should be printed in a bold solid color that stands out against the background so the edges of the square are easily detected, I used Bambu Lab PLA Bright Green. The pictures show how this works. From having the 20mm*20mm reference you can measure the size of the battery, and it is within a percentage to the accuracy of the actual size of the object.