I am using AIEX 100pcs 3D Printing Brass Nuts, M3 Threaded Insert Knurled Brass Nuts Female Thread Knurled Heat Embedment Nut for 3D Printing Parts Loptop Automotive Plastic Shell(M3*4.6x5.7mm): Amazon.com: Industrial & Scientific
The author remixed this model.
Changed to use heatset inserts