QUBD : Twoup : Y-table frame replacement

My Twoup's y-table has gotten loose and vent. So, I designed this as a replacement. Also, I wanted this lighter, to improve the print speed and quality.

Although I use the aluminum print bed in the picture, this design is compatible with the stock MDF print bed.

# Hardware

### Newly Purchase
- Hillman Mending plate 9HL

$3.48 for 6 pcs at my local Lowe's. This design uses 4 out of it.
http://www.lowes.com/pd_364404-37672-884480___?productId=3478229

If this is hard to obtain, I have included the PLA alternative in this design. However, the PLA may not be as strong or light as aluminum.

- 8-32-1/2' Machine screw + nut : 8 pairs ( to hold the brackets to mending plates)
- M3 x 20 screw + nut : 8 pairs (to hold the y-axis shaft)
- (optionally) M4 x 20 + nut : 4 pairs ( to tighten the timing belt. The stock M4 x 16 screw HW10 can be also used, while tightening might be a bit challenge.)

### Recycle from the original kit ( part name in the parenthesis )
- 8m