X,Y Calibration Rule

Information

      When using jigs to align work pieces such as metal business cards the LASER and jig must be exactly aligned.
For example if you want a cross "+" in the exact centre of the business card. You use XCS "Align Centre" or "Align Horizontally + Align Vertically" to position the cross "+" in the centre of the base plate. The jig has to be designed to position the business card in the centre of the base plate. When you process the design the cross "+" should be burnt in the centre of the business card.
This was not the case on my F1. Despite the card being physically centred and the design being centred on the base plate in XCS the F1 is burning the design 2mm to the right and 1mm high of centre.
This is not a problem if you are framing and manually positioning the work piece. Also less of an issue if your design doesn't extend to the edge of the work piece.
Ideally, it would be good if the F1 X and Y centre could be easily adjusted on the machine. A hardware fix would be ideal. In F1 firmware would be the next best option.
There is reference on xtool support documents that XCS has offset adjustment but I've not found this in XCS settings for an F1.
The last resort fix is to measure the inaccuracy and offset all designs by the necessary values.
This Calibration Card allows measurement of the X,Y accuracy and the value of offset required to correct any inaccuracy.
In my case it was a 1mm correction on the X and a 0.5,, correction on the Y to get it near enough.
I've also provided the STL for the jig. The jig is a slight interference fit, i.e. a tight fit, into the base plate cut-out to ensure consistent and accurate positioning of the work piece.