Drag knife adapter (spring mounted)
thingiverse
I needed an adapter that lets me install a drag-knife on my CNC without removing the spindle. The drag-knife adapter allows the blade to move about 5 millimeters in the vertical direction. Before inserting the blade, put a small sponge inside the adapter, which creates a spring effect forcing the blade down but isn't as rigid as something fixed, giving the knife some flexibility so it won't be damaged when placed by the Z-Axis. I use a drag-knife designed for standard Silhouette desktop cutters (available on Amazon at https://www.amazon.com/Silhouette-America-SILH-BLADE-PREM/).
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