1. Unboxing 📦

February 17, 2026

Make sure you have all the parts you need for a smooth and painless assembly; open all boxes and unwrap the parts. Drag chains are stored inside the rails, please check there.

AltMill 4×8 Kit Parts List

X-Axis Rail Box

  • 1x X-axis Assembly
  • 1x 1900mm drag chain
  • 3x Crossbeam Extrusion
  • 1x 48V 12.5A Power Supply
  • 1x 80mm Spindle Mount

Left Y-axis Rail Box

  • 1x 4×8 Y-axis Rail Assembly – Long
  • 1x 4×8 Y-axis Rail Assembly – Short
  • 3x Crossbeam Extrusion

Right Y-axis Rail Box

  • 1x 4×8 Y-axis Rail Assembly – Long
  • 1x 4×8 Y-axis Rail Assembly – Short
  • 3x Crossbeam Extrusion
  • M5-20 XL Tall Socket Head Cap Screw
  • M5 Swingarm Tensioning Bolt
  • M12, 12mm Diameter Shoulder Bolt
  • 12mm Custom Washer
  • M6, 8mm Diameter Shoulder Bolt
  • M4 SHCS – 18mm
  • M5 SHCS – 16mm
  • M6 BHCS – 14mm
  • M6 Twist-In 30 series T-nut
  • M5 SHCS – 10mm
  • M6 BHCS – 10mm
  • M6 BHCS – 14mm
  • M6 Flanged BHCS – 35mm
  • M6 BHCS – 25mm
  • M5 SHCS – 16mm
  • M5 SHCS – 45mm
  • M5 20S T-Nut
  • M5 Washer
  • M5 SHCS – 10mm
  • M5 SHCS – 16mm
  • M5 20S T-Nut
  • M5 Nylock Nut
  • M4 SHCS – 8mm
  • M4 Twist-in 20 series T-Nut
  • Hex Key (L Style) – 4mm
  • Hex Key (L style) – 6mm
  • Hex Key (Wrench with Blue Handle) – 4mm
  • Hex Key (Wrench with Blue Handle) – 3mm
  • AltMill Wrench

Leg Box

  • 8x Table Leg
  • 1x 4×8 LH Tension Bracket + DC Mount
  • 1x 4×8 RH Tension Bracket
  • 2x Gusset
  • 2x Y-axis Jointing Plate
  • 4x Y-axis End Plates
  • 1x 4×8 Z-axis Drag Chain Bracket
  • 1x 4×8 Z-axis Drag Chain Arm
  • 1x Hex key (L style) – 6mm
  • 1x Linear Rail Alignment Tool (packed with M8-14mm)
  • 1x Rack Joint Section
  • 1x Rack Joint Alignment Clamp
  • 2x M5 Cross Dowel
  • 4x Y-axis Sensor Flag
  • 4x Pigtail Inductive Sensor
  • 5x 4×8 Y-axis Bumpstop
  • 4x Integrated Sensor Bumpstop
  • 6x Ziptie (4″)
  • 8x Leveling Feet
  • 2x Cable Covers

Supplemental Parts Box

  • 1x Y-axis Gantry Plate – LH
  • 1x Y-axis Gantry Plate – RH
  • 1x Z-axis Assembly
  • 1x Nema 23 Motor (57-76) with coupler
  • 1x LH Swingarm Drive Unit Assembly
  • 1x RH Swingarm Drive Unit Assembly
  • 1x SLB-Ext Controller
  • 1x SLB Emergency Stop Assembly
  • 1x 3DP E-stop Mounting Bracket
  • 1x SLB Emergency Stop Cable
  • 1x USB-C Cable
  • 4x CLS Motor Cover
  • CLS Motor Fasteners and Hex Key
  • 1x Z-axis Drag Chain
  • 4x Integrated Motor Cable (4×8 Set)
  • 1x Lithium Grease Container

Leg Support Box

  • 2x Y-axis Leg Support Extrusion
  • 4x X-axis Leg Support Extrusion
  • 1x 26×60 Drag Chain – 3392mm Length
  • 2x Drag Chain Carrier Extrusion