diff --git a/hw/boards/mta1-usb-v1-programmer/clip_plastic/base.stl b/hw/boards/mta1-usb-v1-programmer/clip_plastic/base-mta1.stl
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rename from hw/boards/mta1-usb-v1-programmer/clip_plastic/base.stl
rename to hw/boards/mta1-usb-v1-programmer/clip_plastic/base-mta1.stl
diff --git a/hw/boards/mta1-usb-v1-programmer/clip_plastic/base-tk1.stl b/hw/boards/mta1-usb-v1-programmer/clip_plastic/base-tk1.stl
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diff --git a/hw/boards/mta1-usb-v1-programmer/clip_plastic/clip.stl b/hw/boards/mta1-usb-v1-programmer/clip_plastic/clip-mta1.stl
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rename from hw/boards/mta1-usb-v1-programmer/clip_plastic/clip.stl
rename to hw/boards/mta1-usb-v1-programmer/clip_plastic/clip-mta1.stl
diff --git a/hw/boards/mta1-usb-v1-programmer/clip_plastic/clip-tk1.stl b/hw/boards/mta1-usb-v1-programmer/clip_plastic/clip-tk1.stl
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diff --git a/hw/boards/mta1-usb-v1-programmer/clip_plastic/note.txt b/hw/boards/mta1-usb-v1-programmer/clip_plastic/note.txt
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+There are two versions of the case plastic:
+
+MTA1: Used for the OSFC sample PCBs (MTA1)
+
+TK1: Used for Acrab/Bellatrix production PCBs (TK1)
+- This version has a slightly wider opening, to accomodate the slightly wider PCBs. Existing prints were made using green plastic, to distinguish them from the MTA variant.
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