Putting together a BoM from several sources.
Starting at http://reprap.org/wiki/Kossel, but double-checking with some
kit sites.
http://www.builda3dprinter.eu/ has a minor mod which builds little guides
that roll with delrin wheels directly on the extrusion, eliminating
the need for expensive linear guides.
I wish to build this simpler, cheaper option.
<HR>

<HR>

<H3>Frame</H3>
3x 600mm vertical OpenBeam or Misumi HFS3-1515 http://us.misumi-ec.com/vona2/detail/110300465870/?ProductCode=HFS3-1515-600
<BR>9x 240mm horizontal OpenBeam or Misumi HFS3-1515 http://us.misumi-ec.com/vona2/detail/110300465870/?ProductCode=HFS3-1515-240
<BR>
1x 170mm round glass/borosilicate plate Trinity Labs or TriDPrinting.com or Makea3dfactory.com
<H3>Fasteners</H3>
<HR>
<DL><DT>tridprinting.com Kossel-mini screw kit</DT>
<DD>100x M3x8mm stainless steel screws (frame and most connections)
<BR>100x M3 stainless steel nuts
<BR>100x M3 nyloc nuts (tridprinting.com only lists 50.. need more?)
<BR>6x M3x20mm stainless steel screws (arm attachment to vertical carriage)
<BR>12x M3x25mm stainless steel screws (belt idlers and effector-rod attachments) (trid lists 15)
<BR>6x M3x35mm stainless steel screws (tensioners)
<BR>50x M3x6mm stainless steel screws (rail attachment to extrusions - 8mm is too long!)
<BR>12x M3x16mm stainless steel screws (push rod attachment) (trid lists 13)
<BR>6x M2.5x12mm screws (micro switches)
<BR>3x M2.5x16mm (automatic bed leveling probe)
<UL><LI>In trid kit, but not from wiki:
<BR>M5 nut, washer, 20mm M5 screw... for Johann's suggested extruder
<BR>30 M3 washers
<BR>1 Euro connector for autolevel
<BR>1 alan wrench for autolevel</LI></UL>
</DD>
</DL>
Linear motion
<strike>3x 400mm hardened steel rail and carriages HIWIN MGN-12H</strike>
get http://www.builda3dprinter.eu/shop/kossel-kit/rails-to-wheels-conversion-kit/
<BR>
3x 1164mm GT2 belt closed loop with 2mm pitch and 6mm width
6x F623ZZ flanged bearings 3x10x4mm (or F684ZZ 4x9x4mm for printed parts before June 21st)
3x GT2 pulley with 16 teeth and 2mm pitch
3x Kysan NEMA17 stepper motor or TriDPrinting.com.
Diagonal push rods
12x Traxxas 5347 rod ends
12x M4x20mm set screws
6x 180mm Carbon tube ID=4mm
A pre-assembled rod kit is available from TriDPrinting.com
Bowden
1x Clear PFA tubing ID=2mm OD=4mm
2x Push fit connector ID=4mm with M5 thread (or bigger thread before June 21st).
Motor
1x NEMA-17 motor with an integrated Planetary gearbox with a 5 2/11 :1 ratio.(http://robot-italy.com) (http://www.phidgets.com/products.php?product_id=3317 in US).
1x Spur Gear, 22 Tooth, 12mm od, 8mm id - #S10T05M022S0508 from SDP-SIor Builda3dprinter.eu
3x M3-0.5x25 Cap Screw
3x M3 Washer
Idler
1x 625 ball bearing (5x16x5)
1x M5-0.8x20 Cap Screw
1x M5 Washer
1x M5-0.8 Hex Nut (Nylock optional)
1x M3-0.5x16 Cap Screw
1x M3 Washer
1x M3-0.5 Hex Nut, Nylock
Endstops
3x Omron SS-5 micro switch or Honeywell ZM10B10A01
Automatic bed leveling probe

1x Micro switch (same as for endstops above)
1x Bondhus 1.5mm allen wrench
1x Safety pin with 2.5mm loop
2x Ball point pen spring
1x Euro-style terminal block connector
1x Heat shrink tubing ID=2mm
Electronics
1x Baboi or Azteeg_X3 or RAMPS_1.4 or Printrboard or Brainwave other electronics.
1x 12V 5A LCD screen power supply

<HR>
Alfred suggests these hot-ends.  Says they are worth the extra $$.
<BR><A HREF="http://e3d-online.com/E3D-HotEnds/E3D-V5-1.75mm-Bowden-All-Metal-HotEnd">complete with heater, sensor, wire...</A>
<BR><A HREF="http://e3d-online.com/E3D-HotEnds/1.75mm-Bowden-V5-Metal-Only">machined parts only</A>
<DL><DT>spare nozzles</DT>
<DD><A HREF="http://e3d-online.com/E3D-HotEnds/Extra-Nozzle-0.25">0.25mm</A>,
<A HREF="http://e3d-online.com/E3D-HotEnds/Extra-Nozzle-0.35">0.35mm</A>,
<A HREF="http://e3d-online.com/E3D-HotEnds/Extra-Nozzle-0.4">0.4mm</A>,
<A HREF="http://e3d-online.com/E3D-HotEnds/Extra-Nozzle-0.6">0.6mm</A>
</DD></DL>