X-axis stepper mount		2.5x2.5x.375 6061	x
Y-axis stepper mount		2.5x2.5x.375		x
z-axis stepper mount		3.0x4.5x.375 6061	x

z-axis inner block		1.36x3.275x0.5 6061	x
z-axis spacer			2.0x4.0x0.5 6061	x
(z) ballscrew base mount	1.5x4.0x0.5 6061	x
z-axis ballscrew mount		6.0x4.5x0.5 6061	x

ball nut stop block		1.25x1.4x.625 6061	
ball nut stop block		1.25x1.75x.625 6061	

Z-bearing mount			2.5 round x 1.4850 steel
Z-bearing lower retainter	2.0 round x .25 steel

Y-axis bearing mount(spacer)	2.5x1.7x1.1 6061	x Changed to x1" for ease

X,y-axis stepper stand offs	2.5" hex standoffs
Z-axis stepper stand offs	1-3/8" hex standoff, 10-32 threads


Raw Materials list:
6061 rectangle
2.5x.375 - 2.5", 2.5" stepper mounts
3.0x.375 - 4.5" z mount
1x2.5 - 2" 	y bearing spacer
1.5x.5 - 3.5"  (zaxis inner block)
4.0x.5 - 2.0", 1.5" z spacer, ballscrew mount
6.0x.5 - 4.5" z ballscrew mount

round:
2.5" - 1.5" z bearing spacer
2.0" - .375" z bearing flange

hex:
.25" - 2' : stepper motor stand offs

Bearings:
From mscdirect.com:
Y axis: 03548591 3/8 X 11/16 X 9/32 SET THRUST BALL BEARING (2 sets)
Z: 03380961 1.250X1.938X0.078 THRUST CAGE-NEEDLE ASSEMB
Z: 03381142 1.250X1.937X0.032 THRUST WASHER-NEEDLE-FLAT (2)
Z: 03380045 1.250X2.344X0.625 THRUST-BALL-BANDED MEDIUM 
optional:
littlemachineshop carries x-axis thrust bearings. these may be used in place.

Pulleys:
From Stock Drive Products and Sterling Instrument
For Z-axis.
https://sdp-si.com/eStore/
A 6B 3-060037 .200" (XL) Pitch, 60 Teeth, 3/8" Wide, Urethane Belt
A 6A 3-16DF03708 .200 (XL) Pitch, 16 Teeth, Aluminum Alloy Timing Pulley
Hoss used:
A 6A 3-32DF03712 .200 (XL) Pitch, 32 Teeth, Aluminum Alloy Timing Pulley
I ordered this. (The original was out of stock.)
A 6A 3-32NF03712 .200 (XL) Pitch, 32 Teeth, Aluminum Alloy Timing Pulley
Which doesn't have flanges on the pulley, and has a 1.5" hub
Some savings can be achieved by using plastic pulleys. Given the strain, I opted for aluminum.

Ballscrews:
Order from homeshopcnc.com
X axis: 16.15"
Y axis: 9.05"
Z axis: 16"
total: 16.15+9.05+16 = 41.2"
Ballnuts x 3.
(I ordered 42 inches of screw, cut into the three lengths.)

Hardware:
24: 10-32 1/2" hex head screws (stepper mounts)
3: 1/4-20 1.5" hex head screws y spacer/stepper mount
--optional, use metric, don't tap... use 2.
 M6 x 35mm hex bolts

optional: 8" 2" stand-offs, 10-32 threads
	4 more for Z, 1.5"
4: 1/4-20 1/2" hex screws (z inner block mount)
3: 1/4-20 1/2" hex screws (x stepper mount to mill plate)
3: 5/16-18 1/2" hex head (ballscrew base mount, ballscrew anchor)
2: 5/16-18 1.5" hex head (Z stepper base mount to inner spacer)
4: 3/8-24 jam nuts (x,y ball screw retainers)
2: 1/4-20 set screws