8. Assembling rear arm

  1. Bed supporting arm
    1. Rear arm
      1. Hardware
      2. Printed part
  2. Rear arm assembly
    1. Inserting the heat inserts
      1. Inserting heat inserts for bottom
      2. Inserting heat inserts for the side
      3. Inserting heat inserts for top
    2. Installing MGN9 rail
      1. Inserting screws into MGN9C rail
    3. Mini tank!
      1. Inserting the heatset insert
    4. Installing Mini tank on carriage
      1. Installing magnet assembly
      2. Inserting the screws
      3. Installing locking system
      4. M3x6 Flats

Bed supporting arm

Rear arm

Rear arm

The hardware displayed below is for the rear arm assembly.

Hardware

Type:
Amount:
m3x6mm
3
m3x8
Type:
Amount:
m3x8mm
9
m3x8
Type:
Amount:
m3x10mm
1
m3x10
Type:
Amount:
Heatset insert
12
heatset insert
Type:
Amount:
10mm Kossel ball
1
10mm Kossel ball
Type:
Amount:
12x5x4 countersunk magnet
1
12x5x4 countersunk magnet
Type:
Amount:
MGN9C Rail
1
MGN9C rail

Printed part

File name
Description
Download
rear_arm.stl
Rear support arm for print bed
Here
Rear arm
File name
Description
Amount
Download
MGN9C_12x#Mag.stl
Connects the bed to the rail carriage
1
Here
Smoll tank

We have very specific settings you should print the parts with, they’ve been designed around these settings.

Rear arm assembly

Inserting the heat inserts

Printed part required:

Filename : rear_arm.stl Rear arm

Hardware required:

Type:
Amount:
Heatset insert
12
heatset insert

Inserting heat inserts for bottom

Stand your rear arm down on the top surface.

We’re starting our work with the bottom. If possible, clamp it between something, This way, it doesn’t move…

Don’t burn yourself! We’re going to work with a soldering iron, be careful. Heatsets inserts are still hot after melting them into the plastic, don’t touch them!

If you do not know how to insert heatset inserts into printed parts, please watch the video by EDGE OF 3D.

Place the small end of the heatset inserts into the hole. You can start with one heatset so they don’t fall out when you insert the other once. Heatup the soldering iron to about 250℃, you do not want to burn the plastic, you want to let the heatset melt into the plastic. These will be used to mount the leadscrew nut to the arm in a later step.

Insert heatset in bottom

Not sure if the heatset is in straight? Grab a longer M3 screw, and partially thread it in `rig`ht after melting it in, this way you can turn it straight.

Inserting heat inserts for the side

Stand your rear arm down the left surface (from the front), the 3 heatset holes should be facing up.

Place the small end of the heatset inserts into the holes. And start melting them in as shown in the image below. These will be used to attach the cable chain later step.

Insert heatset in side

Inserting heat inserts for top

Stand your Rear arm down the bottom surface.

Place the small end of the heatset inserts into the holes. And start melting them in as shown in the image below. These will be used to attach the MGN9C rail in a later step.

Insert heatset in bottom

Installing MGN9 rail

Hardware required:

Type:
Amount:
MGN9C 100mm
1
MGN9C
Type:
Amount:
M3X8mm bolt
5
m3x8mm

Grab the rear arm and align the MGN9C rail into the top as shown in the image below.

Rear arm align rail

Lower the rail into the slot, there are two tabs that’ll keep the MGN9C carriage from riding off the rail. The front tab is shown in the image below.

Rear arm align rail

Inserting screws into MGN9C rail

Move the carriage to the back, and thread the first 3 M3x8mm screws into the heatset inserts using a 2.5mm hex driver.

Rear arm align rail

Now move the carriage to the front and thread the last 2 M3X8mm screws into the heatset.

Right arm align rail

Mini tank!

Printed part required:

Filename : mini_tank.stl mink tank

Hardware required:

Type:
Amount:
Heatset insert
1
heatset insert

Inserting the heatset insert

We start by melting the heatset insert in into the so called ‘barrel’, this is the hole in the front as shown in the image below.

Right arm

Installing Mini tank on carriage

Hardware required:

Type:
Amount:
m3x8mm
9
m3x8
Type:
Amount:
Heatset insert
10
heatset insert
Type:
Amount:
10mm Kossel ball
1
10mm Kossel ball
Type:
Amount:
12x5x4 countersunk magnet
1
12x5x4 countersunk magnet

We’ve been working on the rear arm and mini tank. It’s time to install the Mini tank onto the carriage. Grab the rear arm and mini tank you’ve prepared in the steps above.

Installing magnet assembly

Grab the rear arm and lower the magnet into the middel of the MGN9C carriage as shown below.

Right arm

Now take the 10mm Kossel ball and center it on the countersunk magnet, note that the threads + hole should face the top.

Right arm

Take the Mini tank you’ve prepared, and lower it onto the magnet + Kossel ball.

Right arm

Your assembly should look something like this:

Right arm

Inserting the screws

Install all 4 M3x8mm screws into the top of the Mini tank and thread them into the MGN9C carriage as shown below.

Right arm

Installing locking system

This system is used to prevent the kossel ball from spinning when installing and uninstalling the bed. A light snug fit should be more than enough.

Hardware required:

Type:
Amount:
m3x10mm
1
m3x10

When you’ve installed everything, you need to make sure the M3x10mm bolts are lose. Locking them into place will stop your Z-system from trimming correctly and might actually damage parts.

Grab the assembly and your M3x10mm screw and lightly thread it into the barrel as shown below. Light fit is enough!

Right arm

The following image shows you how it will lock the kossel ball into place.

Right arm

M3x6 Flats

Instructions for the following hardware will be added later.

Type:
Amount:
m3x6mm
3
m3x8

Next step →