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PLA filament

0.2mm layer thickness, smaller will be cleaner.

The blade can be printed vertically with the handle on the build plate. No supports required. 

The cover requires supports. 

I used an AMS, although not required if you're a dab hand with paint, I'm not. The AMS was useful in addition that PETG used for the support interface and made removal very much easier.

My photo shows modified cover, the models are intended for a single switch location.