It had taken half year to build it, and another half year to trouble shoot and fine tuning.
I'm designing large 3D Printers for my small business and workshop.

It started printing models I've been expecting lately.

In-place printing
What it does is to print all movable parts as a whole model.

I helped two builders last year by printing them plastic parts.

Anybody who really want to experience magic like 3D Printing should consider SLA (Stereolithography )3D Printers that build models out of UV or light reactive resin. It requires only one or two stepper motors, a high-resolution projector, and special resin. DIY kit starts at at $1,000 plus a projector cost.

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Hi,
I bought a RAMPS (RepRap Arduino Mega Pololu Shield) kit for my Mini Kossel 3D Printer.
I couldn't resist the outrageous price from Aliexpress at $35 for the full kit including LCD module.
4x NEMA 17 Stepper motor: 25.20W (Power rating of the motor is 6.3W - 4.2V, 1.5A)
4x A4988 Stepper motor driver: 96W (Power rating of the driver is 24W - 12V, max 2A)
1x Arduino Mega: 2.7W
2x 12V cooling fan: 3W (Power rating of the fan is around 1W to 1.5W - 12V, 0.08A)
1x Heating Resistor, Welwyn W21 6R8 JI: 3W
1x RepRapDiscount Smart Controller LCD: 2W (estimate)
Total power consumption of RAMPS 1.4 controller and electric parts is between 106.70W and 131.90W.
(I don't quite understand relationship between A4988 stepper motor driver and NEMA 17 motor. Does the stepper motor driver delivers power to the stepper motor? Then I think one pair of A4988 driver and stepper motor should be lower than 96W.)
Source:
http://reprap.org/wiki/RAMPS_1.4Third, the MF-R500 (5A) PTC fuse is rated to 30V and the MF-R1100 (11A) PTC fuse is rated to 16V. They will need to be replaced with real fuses.
Two yellow plates are the MF-R500 PTC fuses on below picture. What kind of real fuses should I use for the replacement?

I plan to use a 450W ATX power supply that has 20A capacity for 12V power line. I can buy a new unit under $25.


Source:
http://blomker.com/Kossel_Mini_Assembly_Guide_V1.0.pdfThe building instruction I followed mounts the RAMPS 1.4 board on the aluminium extrusion using two metal bolts like below.
Is it really safe? It's beyond my comprehension honestly.

Temperature of the Hotend, which melts PLA / ABS filament and squeezes out on the printing bed, reaches from 190 to 300 Celsius degrees.
3D Printer can be caught in fire.
Yes, 3D printers can go on fire.
http://forums.reprap.org/read.php?392,294850

I have very rough idea about fail-safe features against potential fire of 3D Printer at the moment.
Thanks in advance,
Hughe