• Y X Z expansion from 120x120x120 mm to 300x200x180 mm
• 200W heatbed (up to 110° C)
• adjustable heatbed height by 6 wheels (2 in the middle rectify bed curvature)
• adjustable Y Belt tension (as X)
• adjustable Z limit switch (by screw)
• Rotary dial knob smaller (more efficient) and moved on tower
• Power button moved from the rear to the left side panel, much more convenient.
• New PSU (Power Supply Unit) 12V 30A that power new heatbed (by Mosfet fixed inside printer) and printer also.
• Y axe expanded, and third Linear bearing and rod added on right side to get more accuracy (less loose), all "mods" i seen let right side of heatbed carriage completely without any support, it work's (i tried) but there is a lot of vibrations due to loose on this half part, it would be a shame to loose the genuine quality of this excellent printer, this major ehancement is decisive to avoid that (but hard to correctly implement due to difficulty of ensure the third shaft a perfect alignement, i warn you about that).
• Printer basement extended by brass spacers sleeve, so right panel offset reach 115 mm, third bearing bracket and x stabilizer bracket fixed on it.
• X axe expanded, and aluminium angle added to guard against twisting, end block replaced including clamping system for shafts, anti-twisting for pulley, and another clamping system for bearings through wich stabilizer rod go (Gantry added).
• To Z gain 50-60 mm, tower has been raised with a 35 mm support (Thanks to "Geonovast"), and extruder motor removed from it and, relative to heatbed, put at the middle above, to keep PTFE tube as shorter as possible, due to that, longer is unchanged and we can re-use original tube (even if on my side i changed it for a smaller 1,9 mm)
• Spool holder location moved to the top of tower, relative to the extruder, and bearing system added to it (thanks to "monsieurglad").
• Rear basement fan removed, replaced with a 60 mm on a new right side panel
• Hotend fan and fan shroud replacement (40mm; thanks to "MysteriousMaker")
• welded small sockets on the hotend wires to make its replacement easier.
• Printer raised by feet (20 mm).
• Rear basement depth expanded and feet added to get more stability due to bed expansion (optional).
• changing idler pulleys. plastic >> Metal
• ... 

HEATBED CARRIAGE 3D MODELISATION

WHAT I'D LIKE TO DO NEXT ?

If i'd had a bit money, my next task would be replacing mainboard, stepper drivers and screen, with MKS xxx, TMC22xx and touchscreen.

But that's another story.

IMAGE GALLERY (click to enlarge)