Paving Slab Spacer

This was a quick print for a wee job im doing in the garden.
Im laying some concrete slabs and wanted some spacers to get the joint even.
The standard gap is generally between 8 - 10 mm , so I made the thickness 9mm.
The idea would be that you lay the slab in place with two of these inserted to create an even space. you then remove before you put the filler / sand in between.
I'll take a photo of them in use later - when I do the actual job.
It was printed in ABS, because that was the only