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Dual extrusion on UM2

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Posted · Dual extrusion on UM2

I'm looking for a team that is interested in dual extrusion on UM2.

To realize dual extrusion on this machine the team should have skills like:

-programing firmware (using actually tinkergnome firmware)

-Plugin for Cura

-people testing the equipment.

-CNC programing/milling ->that's me.

Main issue in dual extrusion is oozing.

To fight that problem I have created a tiny aluminium chiller and a new design for a really fast heater block.

To prevent oozing it is necessary to decrease the temperature of the inactive tool by ~40°, depending on the filament you are using.

In my design the aluminium chiller replaces the small fan , the cooling rib and the bottom hot end holder in the tool head (it makes no noise when idle:))

At the beginning I made test with Olsson block and was disappointed because of long cool down and heat up times.

In the next step I did a redesign of the Olsson block.

1st: Having the extruded material exactly between heater cartridge an PT100 sensor.

2nd: Reduce thermal mass.

3rd: Reduce weight.

Now I'm at a point where I need your help.

The firmware of the printer needs to be improved.

The way I would prefer is:

add a new variable to the file "Material.txt" called "idle_temperature" this variable is stored with each material in the printers software. It should be possible to edit the value online.

When printing a part and there is a tool change ahead, the printer should move to tool change position and heat up the new tool, cool down the inactive tool.


G1 F900 X103.178 Y39.538 E193.22154

G92 E0

G10 S1 ;retract before tool change is already implemented

G1 Z0.275

T1 M6 ; M6 = move to tool change position -> heat up / cool down extruders

G0 F9000 X75.509 Y72.471


G1 Z0.200


G1 F1200 X75.509 Y81.131 E0.69280

G1 X66.849 Y81.131 E1.38560

G1 X66.849 Y72.471 E2.07840

If you are interested, I can provide you:

-A set of heater blocks, replacing Olsson or standard heater block (without nozzles).

-CNC milled dual head chiller. with 2 tube connectors 4mm

-A light weight fan holder as stl file or printed in Polymaker PC-Plus /black .

The cost for a set of heater blocks + water cooled chiller will be 120€.

You need of course a second extruder with all parts leading to the tool head.

A external 80mm aluminium chiller 12€

A brushless water pump. 4€. IMG_8388.thumb.JPG.71ce82c6e37df5ef52c6aa22a486ae70.JPG

Greetings Roland


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