It is a fastening knob for wolfcraft dowelling jig part number 4650000.
One of mine broken, then model and replace with printed one.
Wolfcraft_dowelling_jig_4650000_fastening_knob.stl | 218.1KB | |
Wolfcraft_dowelling_jig_4650000_fastening_knob_0.4n_0.15mm_PLA_MINI_30m.gcode | 2.1MB |