Yesterday I printed a 40cm model: http://www.thingiverse.com/thing:157102 Z scaled 200%. It went better than expected, my worries about the plastic frame giving too much was unwarranted, at least with this model. There's some distortion at couple of places, probably dues to the slider's not moving equally due to different PLA types used. Also some Z-wobble still, the printed nut is too tight and bent rod twists the bed. Need to print a looser one or figure some kind of joint system, dunno. Anyways, the print went better than I hoped, maybe this'll be a printer yet .

0.3mm layer, Esun green PETG @240C. Roughly 5h 20min
https://dl.dropboxusercontent.com/u/45385735/3dprinting/Dollo/2016-12-14 19.29.30.jpg
https://dl.dropboxusercontent.com/u/45385735/3dprinting/Dollo/2016-12-14 19.29.42.jpg
https://dl.dropboxusercontent.com/u/45385735/3dprinting/Dollo/2016-12-14 19.29.59.jpg