Quantity   Component name
3 × LC Technology ULN2003 stepper motor driver board http://www.chinalctech.com/index.php?_m=mod_product&_a=view&p_id=845
1 × Arduino MEGA 2560 https://www.sparkfun.com/products/11061
3 × 28BYJ-48 Stepper Geared stepper, lots of sources...
1 × LED RingCoder Breakout retired - https://www.sparkfun.com/products/retired/11040
1 × Rotary Encoder - Illuminated (RGB) https://www.sparkfun.com/products/10982
1 × Clear Plastic Knob (for rotary encoder) https://www.sparkfun.com/products/10597
1 × Circular LED Bargraphs - Red https://www.sparkfun.com/products/retired/10595
1 × N.O. Momentary Button - Panel Mount (Black) https://www.sparkfun.com/products/11996 or similar
2 × 3 mm white (or whatever you like) LED
1 × Mini DIN6 aka PS/2 femaie connector https://www.digikey.ca/product-detail/en/cui-inc/MD-60SN/CP-2560-ND/143017 or similar
2 × OH090U Hall Effect Unipolar Switch https://www.digikey.ca/product-detail/en/tt-electronics-optek-technology/OH090U/365-1001-ND/374779
1 × Misc Rs, Cs, hookup wire
1 × 0.1 connectors Found that 2x2, 2x1, 4x1, and other housings were useful