Finally posted some pictures of an old 3D printer I made (and then sold). I'm unimaginatively calling it the "TwoUp plus" because it's just a repackaged and rebuilt QU-BD TwoUp. This solves many (but not all) the problems with the TwoUp, including the sagging gantry. Honestly, the TwoUp was a poor printer all around but it was cheap and it was my first. In essence, this was my 3rd printer. I started with the QU-BD TwoUp, moved on to the Robo R1, then the TwoUp plus (produced with the R1), then the Original Prusa MK2, then the Orignal Prusa MK3. I'm waiting for my first resin printer anyday now. I sold this printer over a year ago, but I'm finally getting around to post the pictures.