Quantity   Component name
1 × 550mm 2060 Eurpoean Standard Aluminum Extrusion Frame/backbone for the machine
2 × MGN12H Carriages The fixtures ride on these. Beware of cheap Aliexpress linear rails. The MGN series of rails comes from Hiwin, and I highly recommend getting genuine Hiwin rails.
1 × MGNR12 300mm Rail MGN12H carriages ride on these. Some rails come with carriages.
1 × 400mm T12 Lead Screw, 7mm Lead, 4 Starts For converting rotational motion to linear motion.
1 × T12 Flanged Nut For lead screw.
2 × 7201 Single Row Angular Contact Ball Bearings For use in pillow block.
1 × 6001 -zz/-2rs Deep Groove Ball Bearings For use in securing the lead screw.
1 × 12mm Shaft Collars For use in pillow block.
1 × D25 L40 8mm to 12mm Rigid Coupler For coupling motor and lead screw.
1 × S-Shaped Load Cell Rated for 500kg/1T For measuring loads. You may alternatively use a lower rated load cell as long as it has similar dimensions. It may achieve you better accuracy and lower noise.
1 × Custom PCB The PCB Gerber files are in the materials section. Manufacture this through a PCB manufacturer such as JLCPCB.
1 × Arduino Nano (and cable) See component selection.
1 × ATTiny85-20PU See component selection.
1 × 12/24V Power Supply (and wires) See component selection.
1 × HX711 Board (either XFW or the red type) See component selection.
1 × StepStick Stepper Motor Driver (A4988/DRV8825) See component selection.
1 × Planetary Geared NEMA 17 Stepper Motor (51:1 to 100:1) See component selection.
1 × SSD1306 128x64 OLED Display See component selection.
1 × LM7805 (need heatsink) or Equivalent Package Buck Converter (noisy but no heatsink) See component selection.
6 × B3F-4000 Push Buttons See component selection.
1 × Male and Female 2.54 Pin Headers See component selection.
20 × M5x14mm Button Head Screws Fastener
20 × M3x8 Socket Head Screws Fastener
4 × M12x50mm External Hexagon Screws Fastener
4 × M3x22 Socket Head Screws Fastener
4 × M3x8 Low Profile Screws Fastener
4 × M3x8 Nuts (preferably nyloc) Fastener
2 × M5x50mm Button Head Screws Fastener
2 × M16x25 Screws (or what fits the load cell) Fastener
20 × M5 T Nuts (2020 extrusion type) Fastener
20 × M3 T Nuts (2020 extrusion type) Fastener