I hade same remaining parts from the costruction of my printers so decided to build a little one to test firmwares. The printer has not a control box for this motive. Printing area is 125x138x95higt and is sufficient to have idea if a firmware works correctly before passing it on to the printers I normally use. It was realized in PLA but later it was necessary to build some parts in dense aluminium because it was too light and moved on the bench, so I realized the base parts with 2 kg of aluminium. The original sketchup file is attached. For the hot end fan duct I use the customizer of https://www.thingiverse.com/thing:988310 and then modify it to have the fit for the pla fan. For the radial 50mm fan in the draw I used this thing: https://www.thingiverse.com/thing:1077412, thanks to both designer for the files. I used 4 nema 17-2A-59Ncm that are wasteful but there was only them in my drawer. The non printed parts are the 8mm steel rods and the LM8UU, an E3D V6 self made, some aluminium screw for bed adjust and screws needed to assemble it, wires and connectors, 12V100W adhesive heating surface. I do not build it for print but it print !!! Not like my other printers but acceptable.

2 june 2020: Tested the printer with MKSgen 1.4 and 4988 with good result, then tested skr 1.4 turbo with TMC5160 and had a better finish of parts printed as well as minimized working noise.

UPDATE 12 June 2020: The 8 mm rods lengths : X=265mm ; Y=250mm ; Z=250mm

X rods are not fixed by screws, only print the part then pass a 8mm reamer (not a drill bit!!!) and put the rod in the holes, they will enter forced enough to stay in place.

Y rods are fixed by 4MA screws.

Z rods need to have 4MA threads at the ends to be fixed.

After a lot of use I noticed that it is necessary to protect the lower bearing of the X carriage with heat insulation because the hot-end fan shoots many hot on it, I protect the part with a layer of ceramic fiber.