Do you know how many times the idea of 3D Printing these have been bought up!? I've said in countless threads I'd be happy to model and try and print if someone was willing to loan me a set for a while to do it. A fair few offers to loan the parts but nothing ever came to fruition, no one ever bothered to send or drop some off to me. I have 4 x 3D Printers and have been 3D Printing for a few years now, the largest I have is a CR-10S which has a volume of 300w x 300d x 400h ... These would have to be printed in 2 parts and then some post-processing to join them purely due to the size of them.
I don't want a pair myself, I wouldn't ever use them and personally think they're pointless - BUT, I do recognise others do want and use them and out of community spirit I'd love to see these modelled and printed! I already said I would release the STLs publicly if I modelled them, and also would print for people at "material costs" and not for profit, but alas, still no one was willing to loan me a pair, or never got around to posting them, or sold them with the car, or sold them on on their own... or whatever.
That Ultimaker 3 Extended is a nice machine - but you'll still have to print each side in 2 parts and post process. The build volume is a fraction smaller than my CR-10S
FWIW: I have a CTC Dual (a bit crappy), a Cube 3rd Gen (POS, but was super cheap @ £50 and I've hacked it to use normal filament), a Wanhao Duplicator i3 v1 - still going strong despite being demoted from #1 work horse to #2, and the Creality CR10-S which is my current #1 work horse