Bill of Materials

Item	Unit Cost	Qty	Total	Notes
Phone Mount	$27.99 [Amazon]	1	$27.99
UGREEN 145W Power Bank	$109.99 [UGREEN]	3	$329.97
PD Trigger Cable	$7.95 [Adafruit]	2	$15.90
Mini Power Module	$38.00 [REV Robotics]	2	$76.00
GEEKOM A5 Mini PC	$439.00 [GEEKOM]	1	$439.00
U2D2 Power Hub Board	$21.85 [Robotis]	2	$43.70
U2D2	$36.92 [Robotis]	2	$73.84
DC Barrel Male Pigtail	$13.99 [Amazon]	2	$27.98
DC Barrel Female Pigtail	$12.49 [Amazon]	2	$24.98
Backpack Straps	$38.89 [Amazon]	1	$38.89
Latch	$7.95 [Amazon]	1	$7.95
Shoulder Straps	$9.99 [Amazon]	1	$9.99
93625A200 M5 Nylon Lock Nut	$9.62 [McMaster]	1 pkg	$9.62
94180A321 M2.5x3.4 Heat-Set Insert	$17.56 [McMaster]	1 pkg	$17.56	Shared with arms — one package total
91290A252 M5x25 Socket Head Screw	$10.96 [McMaster]	1 pkg	$10.96
91292A832 M2x8 SS Socket Head	$7.74 [McMaster]	1 pkg	$7.74
91292A016 M2.5x12 SS Socket Head	$7.75 [McMaster]	1 pkg	$7.75
93475A210 M2.5 SS Washer	$2.89 [McMaster]	1 pkg	$2.89
100W PD 19V Laptop Charging Cable	$14.98 [Amazon]	1	$14.98
40×40 T-Slot Aluminum Extrusion	$52.99 [Amazon]	1 pkg	$52.99	Pack of 4
T-Slot Sliding T-Nuts	$8.99 [Amazon]	2 pkg	$17.98

Subtotal: $1,251.11

Item	Unit Cost	Qty	Total
D36V50F5 (5V Stepdown)	$39.95 [Pololu]	2	$79.90
JST Connector Wire Kit	$16.99 [Amazon]	1 pkg	$16.99
JST XH 2.54mm Connector Kit	$8.99 [Amazon]	1 pkg	$8.99
ENGINEER PA-09 Crimper	$41.59 [Amazon]	1	$41.59
WAGO 221-2401 Lever Nuts	$9.95 [Amazon]	1 pkg	$9.95
92125A086 M2.5x8 SS Flat Head	$6.50 [McMaster]	1 pkg	$6.50
94180A323 M2.5x5.6 Heat-Set Insert	$24.72 [McMaster]	1 pkg	$24.72
91294A020 M2.5x12 Black Flat Head	$6.45 [McMaster]	1 pkg	$6.45
94180A321 M2.5x3.4 Heat-Set Insert	$17.56 [McMaster]	1 pkg	$17.56
M2 Heat-Set Inserts	$8.99 [Amazon]	1 pkg	$8.99
M2x6 Pan Head Screw	$4.69 [Amazon]	1 pkg	$4.69
97763A822 M5x16 SS Button Head	$6.66 [McMaster]	1 pkg	$6.66
USB-C to USB Cable	$8.99 [Amazon]	1 pkg	$8.99

Subtotal: $241.98

Item	Unit Cost	Qty	Total
XM540-W270-T	$482.89 [Robotis]	2	$965.78
XM430-W350-T	$310.39 [Robotis]	2	$620.78
XL430-W250-T	$45.36 [Robotis]	2	$90.72
XL330-M288-T	$27.49 [Robotis]	1	$27.49
FR13	$76.71 [Robotis]	2	$153.42
FR12	$46.69 [Robotis]	3	$140.07

Subtotal: $1,998.26

Item	Unit Cost	Qty	Total
XM540-W270-T	$482.89 [Robotis]	5	$2,414.45
XM430-W350-T	$310.39 [Robotis]	1	$310.39
XM430-W210-T	$310.39 [Robotis]	1	$310.39
XL330-M288-T	$27.49 [Robotis]	1	$27.49
FR13	$76.71 [Robotis]	5	$383.55
FR12	$46.69 [Robotis]	1	$46.69

Subtotal: $3,492.96

Required only for their respective modules; not included in the build subtotals above since many users already own them.

Item	Unit Cost	Qty	Total	Notes
Apple Vision Pro	$3,699.00 [Apple]	1	$3,699.00	Head-tracking module
iPhone	from $599.00 [Apple]	1	$599.00	Base-control module; any recent iPhone works (mounts on the backpack phone mount)