Thanks for quick respond.
I appreciate that it is not simply a matter of longer rods and bigger box and build plate and must admit that my gut find the rods indeed a bit thin for such lengths. Some Chinese manufacturers though (up to approx 400 x 300 build plate) have done this, look a bit like a stretched UM and seem to work and are being sold (legal issues?) even though some reviews are a bit 'scary'. I find it a bit strange that Ultimaker, considering its commercial succes, has not entered this avenue (albeit as a kit with stronger rods, etc) as it is a logical fact that this too will find a huge market closing another gap towards hard-tooling.
I am building relatively large flat 'trays' and despite your arguments about a large printer being 'freakishly slow' (you are just building bigger products, print speed may be slightly less considering added inertia) I think that I would gain massive time (and simpler and more reliable design) printing them in one-go instead of all the warming-up, cooling down, gluing, tolerance issues and whatnot.
Note: I bought an UM2 based on specs re. build surface of 223 x 223 which turned out to be a mere 195 x 195
So from your much appreciated reply I understand that no efforts are being undertaken but if I am wrong I would be more than happy to hear from Ultimaker (community) or others on what the status is. Meanwhile I will have to conclude to go on outlook for an alternative.
There are a ton of problems with larger printers. It's not just "simply" increasing the axis (Only increasing the length will mess up tolerances / sagging, etc).
If you do manage to get that right (at which point you already redesigned the head & entire carriage system), you also need to swap out the bed & power supply (as the current external power supply is the biggest you can get). Due to legal issues Ultimaker (or any commercial company) can't sell this as a ready to go product (selling kits for this however is allowed)
Even if you get all this, you still have the problem of it being freakishly slow. A "normal" ultimaker has a build volume of +- 223 x 223 x 205 = 10194445 cubic mm
Your increased version would have 300 x 300 x 205 = 18450000 cubic mm.
This usually means that printing on full bed will take about 1.8 times as much (and you only added 80 mm on both ends!)
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