Built an Original Prusa i3 MK2.

Now I have two RepRap 3D Printers. The left side is one day old Prusa i3 MK2, the right side is RepRapPro Fisher Beta, which I replaced most acrylic parts with steel and aluminum and named it Steel Fisher.

steel-fisher-and-prusa-i3-mk2

After upgrading RepRapFirmware v1.12a-dc42, Duet Web Control v1.11, installation of B’struder equipped with geared Nema 17 stepper motor. Steel Fisher has showed impressive performance so far.

It already printed all parts for building Fisher 1 3D Printer, had taken 16 hours of printing. I set the layer height 0.2 mm. The printing quality is better than the kits.

steel-fisher-20161010_0042

The total weight of Fisher 1’s parts is 184.6 g.

steel-fisher-20161010_0046

Review of Original Prusa i3 MK2 kit

I bought an Original Prusa i3 MK2 from Prusa Research in Czech Republic. It arrived last weekend. The major reasons I chose is probably the best printing quality among RepRap 3D Printer kits in the market.  This is the first Cartesian 3D Printer and I would use this as benchmark against my Delta 3D Printer development.

The print bed alignment by twisting Y-axis frame is tedious. I spent probably an hour to align the print going through eight adjustments.  The manual says visual inspection of parallelism between the print bed’s grid line and X-axis rods is sufficient.

Here is the measurement of left-most and right-most point I got:


55.0 54.0

55.15 54.25

55.25 53,15

54.15 53.85

53.50 52.70

52.90 52.50

54.70 54.40

54.85 54.70* (I stopped here)

A bag of candy, HARIBO Happy Cola. I considered Coca Cola is toxic black water, and haven’t drank a bottle of coke for decades.  I ate it the candy though.

prusa-i3-mk2-build-20161012_0050

The packaging was meticulous. prusa-i3-mk2-build-20161012_0052

Checklist of main components.prusa-i3-mk2-build-20161012_0055

The company should provide the tools as an option that might save $10 to $15 depend on individual buyers. I already had the tools. Except flat head screw driver, the others’ quality is below average.  I had to file one of wrench’s tip.

prusa-i3-mk2-build-20161012_0059

Some parts had to be cleaned up like this.prusa-i3-mk2-build-20161012_0064

Nema 17 stepper motors

BLK GRN RED BLU

1          2        3       4

Measurement of pair of coil resistance:

X-axis motor: 1-2 is 7.8 ohm, 3-4 is 7 ohm

Y-axis motor: 1-2 is 6.8 ohm, 3-4 is 6.8 ohm

Z-axis motor, left: 1-2 is 8.4 ohm, 3-4 is 8.3 ohm

Z-axis motor, right: 1-2 8.3 ohm, 3-4 is 8.4 ohm

prusa-i3-mk2-build-20161012_0069

It doesn’t have provide adjuster of the belt tension. This is an outstanding design flaw.

Y-axis belt holder.prusa-i3-mk2-build-20161012_0076

The print bed frame where the heated bed mounts.prusa-i3-mk2-build-20161012_0078

It comes with a pre-built Genuine E3D V6 Hotend. E3D improved thermistor installation. Previous design which I broke the original thermistor, later on I drilled a hole on the heater block to install a diode type thermistor.

prusa-i3-mk2-build-20161012_0083

Direct drive extruder prusa-i3-mk2-build-20161012_0085

The effector assembly has two fans, heat sink and layer (print). The blower acts as a layer fan (print fan according to the assembly instruction).

prusa-i3-mk2-build-20161012_0087

Joseph Prusa must love zip-ties. The effector assembly has 15+ zip-ties.

prusa-i3-mk2-build-20161012_0090

The PCB heated bed is the print bed.prusa-i3-mk2-build-20161012_0103

prusa-i3-mk2-build-20161012_0106

prusa-i3-mk2-build-20161012_0110

I removed extra film on the edge.prusa-i3-mk2-build-20161012_0096prusa-i3-mk2-build-20161012_0100

M3 nut hole of most black parts were dirty and dimensional inaccuracy.

The image is cover base of Rambo-mini controller.prusa-i3-mk2-build-20161012_0115prusa-i3-mk2-build-20161012_0122

Genuine Rambo-mini board.

It’s compact version of the RAMPS kit for RepRap 3D Printer:

  • Arduino Mega 2560 – 8 bit processor
  • RAMPS shield
  • Five stepper motor drivers

prusa-i3-mk2-build-20161012_0131prusa-i3-mk2-build-20161012_0135

Mounting the board was inconvenient due to small size of the cover base.prusa-i3-mk2-build-20161012_0138

I cut 43 cm length of Hoten’s thermistor wires, and made 2 pin connector. prusa-i3-mk2-build-20161012_0140prusa-i3-mk2-build-20161012_0142

5A blade fuse.

The dimension matches conventional automotive fuses, which is easy to have spares. The board has two 5A fuses, one 15 A fuse.

prusa-i3-mk2-build-20161012_0146

About janpenguin

Email: janpenguin [at] riseup [dot] net Every content on the blog is made by Free and Open Source Software in GNU/Linux.
This entry was posted in Reprap 3D Printer and tagged , , , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s