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Tapster Bill of Materials:

Bitbeam

3D Print:
Qty     Description
4       3x1 beam
5       9x1 beam
2       11x1 plate
12      Coupler
3       Servo mount
1       Stylus holder
3       Upper arm


3D Print or Mill:
Qty     Description
1       Top plate
1       Base plate
3       Side plate
1       Arduino plate

Indigo.com

Qty     Description                                             Part #          Unit Price
24      Rod magnet, D5 x 7.5mm, Nd rare earth, N42              44201-7.5       $0.44

McMaster-Carr

Socket Bolts:
Qty     Description     Long Description:                               Part #     Unit Price
5       4-40 1/2 in     Black-Oxide Alloy Steel Socket Head Cap Screw   91251A110   $8.34 per pack of 100
6       6-32 3/4 in     Black-Oxide Alloy Steel Socket Head Cap Screw   91251A151   $8.50 per pack of 100
30      10-32 3/4 in    Black-Oxide Alloy Steel Socket Head Cap Screw   91251A345   $9.93 per pack of 100
4       10-32 1 in      Black-Oxide Alloy Steel Socket Head Cap Screw   91251A347   $7.82 per pack of 50     

Hex Nuts:
Qty     Description             Long Description:                                       Part #      Unit Price
5       4-40 nuts               Black Nylon 6/6 Hex Nut                                 94812A200   $5.63 per pack of 100
6       6-32 nuts               Zinc-Plated Steel Machine Screw Hex Nut                 90480A007   $1.16 per pack of 100
30      10-32 low-profile nuts  18-8 Stainless Steel Undersized Machine Screw Hex Nut   90730A411   $6.18 per pack of 100

Misc:
Qty     Description                                 Long Description:                   Part #      Unit Price
12      3/8" Steel ball bearing                                                         96455K54    $5.87 per pack of 250
6       12cm 6-32 Zinc-plated steel threaded rod    (Sold in 6ft sections)              98914A007   $3.67 for 6ft

Servocity

Qty     Description                                             Part #          Unit Price
3       Hitec HS-311 servo (clockwise rotation)                 31311S00        $7.99

Staples

Qty     Description     Long Description                        Part #          Unit Price
1       Tablet stylus   QVS ISE-SV Extending Mini-Stylus        IM1NZ0711       $3.99

Electronics:

Adafruit.com

Qty     Description     Long Description                                    Part #          Unit Price
1       Power adaptor   9 VDC 1000mA regulated switching power adapter      63              $6.95

Amazon.com

Qty     Description                                                         Part #          Unit Price
1       SainSmart Sensor Shield Digital Analog Module V4                    B006TQ314G      $12.80

Jameco.com

Qty     Description             Long Description                            Part #          Unit Price
1       Arduino Uno             MCU,ARDUINO UNO R3,DIP,14DI                 2151486         $29.95
1       USB cable               CABLE,USB2.0,A/B,3',BLACK                   222608          $1.95
1       Alligator clip          ALLIGATOR CLIP TEST LEADS, 24 AWG WIRE      2185483         $1.95

Tools:

McMaster-Carr

Screwdrivers:
Qty     Description         Long Description:                           Part #:     Unit Price:     Note:
1       3/32 hex driver     Comfort Grip Ball Driver                    5497A25     $2.27           For 4-40 screws
1       7/64 hex driver     Comfort Grip Ball Driver                    5497A26     $2.31           For 6-32 screws
1       5/32 hex driver     Comfort Grip Ball Driver                    5497A29     $2.69           For 10-32 screws
1       5/16 wrench         Miniature Inch Combination Wrench           5443A28     $10.69          For 10-32 nuts
1       Philips #1 driver   Ultra-Grip Screwdriver with Antislip Tip    55095A32    $3.61           For servo mount

Materials:

For 3D Printers: ABS plastic from Ultimachine

For CNC Mills: Plywood and Basswood from Blick Arts / Midwest Products

Miscellaneous:

Uline

Qty     Description
1       8X8x14 box
1       Red bag