The switch on my Toastmaster electronic carving knife broke and this is a replacement for it. Print it with supports everywhere. I used PETG filament. The way the switch works is this plastic piece pushes a metal strip down to make contact with another contact. my switch broke into two pieces.
Unplug your knife and disable by removed most of the screws to reveal the switch. There you can depress the retaining tabs (4) to release the old switch. Insert new piece and reassemble. Note this replacement part doesn't have the extra little tab that spring loads to return the switch to the off position when released, but it's easy enough to keep your finger on it while using to control on/off. Use at your own risk.