I initially tried downloading existing files of GT2 end clips but couldn't find any that met all of my criteria:
1) it had to be a single bolt fixture
2) it had to utilize M4 12mm bolts (which I had a lot of)
3) it had to have an easy way of gripping the belt without damaging it
4) it had to have a 1.5mm spacer underneath to push the GT2 belt down to the exact height of standard V-rollers on the Sculpfun S9 and other similar machines.
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After some fiddling around, I managed to whip up a belt clip that had all of the advantages of the designs I saw online, and none of the disadvantages except being slightly longer.
You'll need M4 12mm bolts to affix these and a matching T-type extrusion nut per clip.
The author marked this model as their own original creation.