This design uses a mix of 3D printed parts, various lengths of 5mm dowels and a few springs. Everything can be printed without support material (in PETG and PLA, at least) but brims may be required for some parts. Below is a list of all the non-printable parts:

• 5mm Metal Dowels - These can be purchased on Amazon or other websites in either kits with multiple sizes or packets of specific sizes. For this project you need:
  • Required
    • (1) 10mm x 5mm
    • (2) 12mm x 5mm
    • (5) 16mm x 5mm
    • (1) 20mm x 5mm
    • (4) 30mm x 5mm
    • (3) 35mm x 5mm
  • Handle (Required, but size can vary)
    • (5) dowels required, 20mm x 5mm min, 35mm x 5mm max
  • How to get dowels? Search “5mm metal dowels” on Amazon, or other wholesalers, and there are many options. You can buy kits with a variety of size, but I have not found a kit with every size needed for this project. The most efficient way that I know is to purchase the 2 items below:
    • Hilitchi 110 Pcs Kit:
      • https://www.amazon.com/gp/product/B07F3T5FKL/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
    • 12mm x 5mm dowels:
      • https://www.amazon.com/dp/B0BFRRQJZ7?ref=ppx_yo2ov_dt_b_product_details&th=1
• Springs
  • I used ‘METALLIXITY’ springs. This is the product page:
    • https://www.amazon.com/dp/B0B6J295FG?ref=ppx_yo2ov_dt_b_product_details&th=1
  • According to Amazon, the mechanical properties of the springs are:
    • Outer Diameter: 4mm/0.16"; Wire Diameter: 0.3mm/0.01"; Free Height: 20mm/0.79"; Compressed Length: 12mm/0.47"; Load Capacity: 2N; Spring Rate: 0.25 N/mm
  • I'm sure other springs would work, but I tested a few different types and most were a bit too strong, making it difficult to insert the key.
• Refer to diagrams below for size and locations of dowels