Add "Bitter USB Cam" mount for 1514 extrusions (#992)

printer_mods/jangrewe/Bitter_USB_Cam/.metadata.yml

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+cad: 
+- CAD/Bitter_USB_Cam.step
+images:
+- Images/Bitter_USB_Cam.png
+description: Modification of the "Angry Cam USB v2.0" webcam mount for 1515 extrusions
+mod_version: 1
+printer_compatibility:
+- V0
+title: Bitter USB Cam

printer_mods/jangrewe/Bitter_USB_Cam/README.md

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+# Bitter USB Cam
+
+![Bitter USB Cam](Images/Bitter_USB_Cam.png)
+
+This is a modification of [chri.kai.in's Angry CAM USB v2.0](../../chri.kai.in/Angry_CAM_USB) webcam mount for 1515 extrusions. It reuses the cam shell and front/back covers, and only changes the mounting blocks to fit "behind" the front extrusion of the top hat to looks down onto the bed.
+
+If you're wondering about the name: This USB Cam is not quite angry, as you can't see the furrowed eyebrows (couldn't fit them on there), so it's just bitter.
+
+For all instructions and further information, please have a look at the original [Angry CAM USB v2.0](../../chri.kai.in/Angry_CAM_USB)