• NUMERICAL CALIPER OR ANALOGIC but with at least a tenth millimeter accurate

• SOLDERING IRON (and solder)

• METAL SAW

• SET OF METAL FILES

• ELECTRIC DRILL

• AND a SET OF METAL DRILLS (D 2 to 10)
• Some intermediate diameters will be usefull, especially 3,5 mm

• A GRINDER, ONLY IF YOU HAVE TO CUT A LINEAR  SHAFT (Hard alloy)

• FRAMING SQUARE

• AND RULER

• WIRE STRIPPERS

• WIRE CUTTER

• SET OF ALLEN WRENCH

• GLUE, PREFERABLY EPOXY  (bi-comp) for metal, BUT CONTACT NEOPRENE WORKS ALSO, OR EVEN CYANOLIT . Its for Heatbed carriage aluminium angles, though it's not a mandatory because there will be screwed, but in my view it's not enough and it's better to secure permanently angles at right angle (90 °). Having a perfect parallelepiped heatbed carriage with accurates right angles is crucial to have a good slide and a straight heatbed.

• Of course a Plier, and a good Phillips screwdriver  that should correspond as closely as possible to printer screws size (there only on type in all the printer)

• PIN PUNCH to remove X axe 6 mm shafts on z carriage, but any metal cylinder part less than 6 mm will fit.

• HAMMER

• Sandpaper

•  A TAMED KANGAROO

OPTIONAL, YOU WILL BENEFIT FROM HAVING PILLAR DRILL, BUT IT'S NOT A MANDATORY.

• A VISE ALSO COULD BE USEFUL BUT YET NOT A MANDATORY