3d printer on the rails for "25 thousand rubles" with their own hands. The main components

After the post was published, I was asked to write about the components, so please :)
In quotation marks, because the ruble exchange rate is poorly predictable, but I managed to keep up with such a sum with a dollar exchange rate of 55-60 rubles.
All parts are only for this case, which can be ordered by writing to this person, or if you decide to assemble in another case , then there may be minor changes, but in general the components are the same.
So we need:
Body:

6000 rubles

• 3 rails 250 mm long with MGN9H carriages about 3000 rubles
• 4 stepping motor Nema 17 (17HS4401) approximately 4000 rubles
• Power supply 12V 30A 360W approximately 1700 rubles
• GT2 belt and two rollers with 20 teeth about 270 rubles
• Coupling on the axis Z 5 * 8 mm about 100 rubles
• Ramps 1.4 + Mega2560 with drivers about 1500 rubles
• Screen 2004 about 650 rubles
• Bearings for the table 4 pcs LM10UU about 700 rubles (10 pieces)
• F623ZZ bearings need 8 pieces, sold both at 10 and 20 pieces at about 750 rubles (20 pieces)
• Extruder block with 1.75 mm Bowden tube approximately 650 rubles
• Gear on the extruder 1 piece about 170 rubles
• The shaft on the Z axis is sold for several pieces, you need only 1 approximately 1,300 rubles
• table with glass, substrate, heater and thermistor 214 x 214 mm all in the collection of about 1500 rubles
• bearings 624zz Approximately 100 rubles
• To modify the thermal barrier tube 120 rubles
• Guides 10 mm on a table 330 mm 2 pieces about 900 rubles per meter
• Connectors 4 and 2 pins for connecting motors, sensors and limit switches about 200 rubles
• Fans are already selected by personal preference in the radio store. Two 60 x 10 down for blowing the boards, one for an extruder for 40 and two blowing parts 30 x 10
• One switch and connector for the power cable is searched for disassembly or in the electrical goods store, wires, clamps ...
• Countless M3 screws of various sizes with nuts, approximate count:
  

  m3 * 10 - 6 pieces, top cover.
  m3 * 16 - 50 pieces, everywhere :)
  m3 * 20 - 2 pieces, upwards boxes on the sides.
  m3 * 25 - 10pcs, sweat
  m3 * 30 - 2 pieces, sweat.

  
  But for some reason it seemed to me that I needed more, so for example.
  
• Connector for an SD card, in fact, it already has a screen, there is already a matter of convenience about 72 rubles

Total we have: 23682 rubles, the price of components is approximate, you know why :)
Yes, I almost forgot, the most important tool


A small addition. The authors of these cases laid out their good instructions for assembling these printers, so I see no reason to rewrite their work.