This is a work in progress
I wanted to see if I could fit THE100 to fit an Ender3 bed.
 
**still require testing**
**part is not orientation optimization**

and I didn't want to make the printer anymore bigger

as in the picture, the color red is the dead zone green is the printable area but it is also the most even heated area of stock heated bed ender3 as the thermal image shows (from Thomas Sanladerer 

)

it still uses the original bed carrier and spring to level the bed remove the V-slot wheel 

I replace the knobe with https://www.printables.com/model/204097-m4-knurled-bed-leveling-knob-for-ender-3-parametri
 

update:the top frame has to be moded 

update:top frame has been mod,require 2 more LM8UU the bed now connect with 4 conner

thing need to print 
frame Connection inside x2
anything else one each