You definitely can do your own HB solution. You have to worry about thermistor, firmware upgrade (that I can help you with easily), wiring, possible relay, power supply...
The UM upgrade however gives you a much better steel bed. My old wooden bed had to be releveled every day - it kept slumping due to my heavy heated bed (home built). But the upgraded steel bed held it's position for a month. No leveling needed for a month!
Obviously I wouldnt fit it ontop of the acrylic bed, but not impressed with having to level all the time so that would put me off, its over 6months since I levelled bed on my Davinci.
I have a machine shop near me who have a laser that can cut alum so might get some blanks made and go that route.
Thought it strange they changed to a 8mm leadscrew with a heavier alum bed the original has a 12mm leadscrew, you would think it should be the other way around
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meduza 191
The original buildplate is acrylic, wich is not very heat tolerant, so do not try to mount it to that one.
There are cheap third-party heated beds that fit the Ultimaker Original more or less without any modifications except a larger power supply if you want to do it on the cheap.
The Official HBK is a very nice upgrade tough, a much nicer construction, new Z motor with integrated leadscrew, included power supply etc. Premium quality for a premium price :-)
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