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MATERIALS.md

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Chrumm Bill Of Materials

Mechanical

  • 12x Threaded insert, M3, 4mm hole diameter, max 5.7mm length
  • 12x Countersunk screw, M3, 8mm total length, ISO 10642
  • 7x Hex nut with nylon insert, M3, ISO 10511
  • 2x Hex nut with nylon insert, M2
  • 7x Socket head cap screw, M3, 8mm thread length, ISO 4762 (*)
  • 2x Socket head cap screw, M2, 6mm thread length, ISO 4762
  • 2x Ziptie, 2mm width, 1mm thickness
  • 14x 3M Bumpon SJ5302, hemispherical, 8mm diameter, 2mm height
  • 2x Artificial leather, ~190x130mm, max 1.2mm thickness
  • Glue for artificial leather on printed filament
  • Keycaps (in photo: Akko WOB Building Blocks, MDA profile)

(*) Some of the screws are difficult to reach and require a ball-point driver, or a short-armed key.

Electronic

  • 2x PCB
  • 1x Raspberry Pi Pico, SC0915, without pre-soldered headers
  • 1x USB cable, A to micro-B with small head, shielded, max 4mm diameter
  • 64x Diode, 1N4148, DO-35 through-hole format
  • 64x MX switch
  • 1x Bourns PEC11R-4215F-N0024 rotary encoder, M7 nut mount, 15mm flatted D-shaft
  • 1x TE Flexstrip FSN-22A-8, 0.1" pitch, 2" length, 8 conductors (**)
  • 1x TE Flexstrip FSN-22A-5, 0.1" pitch, 2" length, 5 conductors (**)
  • 1x TE Flexstrip FSN-23A-3, 0.1" pitch, 3" length, 3 conductors (**)

(**) It might be cheaper to buy strips with more conductors and cut them apart as needed.

3D-printed

  • 2x Body half (left, right)
  • 2x Floor half (left, right)
  • 2x Palm rest (left, right)
  • 1x Rotary encoder knob
  • 1x Diode bender jig, 7.62mm pitch (300mil)
  • 12x Diode standoff jig