I put together this kit cause I was going to upgrade my Ender 3 Pro's bed to a 220x400mm size
I just changed my mind. 
I dont think I need my printer to be that big cause most of the stuff I print is small.
This stuff has never been used but its pretty much all you need to upgrade to a 400mm bed size.
Just shoot me an offer.


Here is what I paid:
$41
ANWOKIT 2Pcs Linear Guide Rail kit 
HGR25-500mm Linear Slide Rails with 4Pcs HGHCA25 
HGH25 Linear Blocks Bearing + Dust Cover C6 + 
Socket Head Cap Screw for DIY CNC Routers Lathes Mills   





$37
Chengliang Power Supply Dc 24v 17a 400w Original Ender 3 3D Printer Switching PSU UL Certified

$10
Thermal overload sensor just in case

$100
Keenovo Silicone Heater 250mm x 400mm for Tevo Black Widow 3D Printer Build Plate HeatBed Heating Upgrade