You can make one yourself: MPCNC Primo Schneewittchen - Oldenburg, Germany - #41 by Tokoloshe
A simple aluminium plate with the two contacts works as well, or even only aluminium foil.
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You can make one yourself: MPCNC Primo Schneewittchen - Oldenburg, Germany - #41 by Tokoloshe
A simple aluminium plate with the two contacts works as well, or even only aluminium foil.