I am unsure if the SM1 works the same way as the SM2 for setting the work origin but when I laser etch coasters I too need to etch them centrally.
For myself, I have found the easiest way to do this is to affix the coasters to the laser grid with double sided tape and then using a paper template of the same shape/size as the coaster with the centre marked, I align the work origin.
Would this not be simpler that needing to create/affix a jig each time? Do you think there are any specific benefits to using a jig over the method I described above?