When in doubt, *always* use liquid nitrogen!

Using those cooler packs you use for camping might better. Those remain cool for a long time.

I am, slowly, trying to change the setup to a push construction, instaed of the pull concept, because there is so much friction in the short curve at the bottom. The grinding will be related to that I guess..

Or you could replace the pla at that point by thin steel cable or so.

The 100 ml syringe (http://www.polyservice.nl/Injectiespuit-p-16476.html) feels easier to push, but has more material to displace, have to test that.

If it works to push the material, maybe it could work in combination with the Doodle3D box….

I am, slowly, trying to change the setup to a push construction

Seems someone had the same idea. A more generic setup for various liquids.

- 4 weeks later...

This is what finally worked; a combination of different ideas and some of my own.

http://www.thingiverse.com/thing:14421

- parts from Joris, some files are old and don't fit any more. The printhead layout changed a lot.

http://www.thingiverse.com/thing:21302/

- from mechadense. But with this setup the winding part broke (lots of force here). But this idea works because the use of spectra line through a bicycle/motorcycle brake tubes instead of thick filament.

I also had to replace the cap of the syringe part by a wooden layered part; the printed one in XT broke...

and of course made some spacers for the limit switches X ,Y and Z to prevent collision. Especially for the Z height to compensate for cookies or so.

when placing an object in Cura, mind that the object will not be printed in the center but more to the right and back. This could probably be edited in the gcode as well.

Here is the gcode, for a chocolate star with cold extrusion:

;Sliced ?filename? at: Sun 24-08-2014 13:38:22

;Basic settings: Layer height: 0.3 Walls: 14 Fill: 0

;Print time: #P_TIME#

;Filament used: #F_AMNT#m #F_WGHT#g

;Filament cost: #F_COST#

M302

G21 ;metric values

G90 ;absolute positioning

M107 ;start with the fan off

G28 X0 Y0 ;move X/Y to min endstops

G28 Z0 ;move Z to min endstops

G92 X0 Y0 Z0 E0 ;reset software position to front/left/z=0.0

G1 Z15.0 F?max_z_speed? ;move the platform down 15mm

G92 E0 ;zero the extruded length

G1 F200 E3 ;extrude 3mm of feed stock

G92 E0 ;zero the extruded length again

;go to the middle of the platform (disabled, as there is no need to go to the center)

;G1 X?machine_center_x? Y?machine_center_y? F9000

G1 F9000

;Layer count: 1

;LAYER:0

M107

G0 F9000 X98.55 Y60.53 Z0.30

;TYPE:WALL-INNER

G1 F600 X100.79 Y60.54 E0.01190

G1 X101.91 Y58.60 E0.02380

G1 X103.02 Y60.54 E0.03569

G1 X105.26 Y60.53 E0.04758

G1 X104.14 Y62.47 E0.05947

G1 X105.26 Y64.41 E0.07137

G1 X103.02 Y64.41 E0.08327

G1 X101.90 Y66.35 E0.09516

G1 X100.79 Y64.41 E0.10705

G1 X98.55 Y64.41 E0.11895

G1 X99.67 Y62.47 E0.13084

G1 X98.55 Y60.53 E0.14273

G0 F9000 X99.63 Y58.54

G1 F600 X101.91 Y54.58 E0.16696

G1 X104.18 Y58.54 E0.19118

G1 X108.74 Y58.52 E0.21540

G1 X106.45 Y62.47 E0.23962

G1 X108.74 Y66.42 E0.26385

G1 X104.18 Y66.41 E0.28807

G1 X101.91 Y70.37 E0.31230

G1 X99.63 Y66.41 E0.33652

G1 X95.07 Y66.42 E0.36074

G1 X97.36 Y62.47 E0.38496

G1 X95.07 Y58.52 E0.40919

G1 X99.63 Y58.54 E0.43342

G0 F9000 X98.48 Y56.53

G1 F600 X101.91 Y50.56 E0.46997

G1 X105.33 Y56.53 E0.50652

G1 X112.22 Y56.52 E0.54307

G1 X108.76 Y62.47 E0.57962

G1 X112.22 Y68.43 E0.61618

G1 X105.33 Y68.41 E0.65273

G1 X101.91 Y74.39 E0.68928

G1 X98.48 Y68.41 E0.72583

G1 X91.59 Y68.43 E0.76239

G1 X95.05 Y62.47 E0.79894

G1 X91.59 Y56.52 E0.83549

G1 X98.48 Y56.53 E0.87204

G0 F9000 X97.32 Y54.53

G1 F600 X101.91 Y46.54 E0.92092

G1 X106.49 Y54.53 E0.96981

G1 X115.70 Y54.51 E1.01869

G1 X111.08 Y62.47 E1.06757

G1 X115.70 Y70.44 E1.11645

G1 X106.49 Y70.42 E1.16533

G1 X101.91 Y78.41 E1.21421

G1 X97.32 Y70.42 E1.26309

G1 X88.11 Y70.44 E1.31197

G1 X92.73 Y62.47 E1.36085

G1 X88.11 Y54.51 E1.40973

G1 X97.32 Y54.53 E1.45861

G0 F9000 X96.16 Y52.53

G1 F600 X101.91 Y42.52 E1.51982

G1 X107.65 Y52.53 E1.58102

G1 X119.18 Y52.50 E1.64224

G1 X113.39 Y62.47 E1.70344

G1 X119.18 Y72.45 E1.76465

G1 X107.65 Y72.42 E1.82586

G1 X101.91 Y82.42 E1.88706

G1 X96.16 Y72.42 E1.94827

G1 X84.63 Y72.45 E2.00948

G1 X90.42 Y62.47 E2.07069

G1 X84.63 Y52.50 E2.13189

G1 X96.16 Y52.53 E2.19310

G0 F9000 X95.01 Y50.52

G1 F600 X101.91 Y38.50 E2.26664

G1 X108.80 Y50.52 E2.34018

G1 X122.67 Y50.49 E2.41372

G1 X115.70 Y62.47 E2.48726

G1 X122.67 Y74.46 E2.56080

G1 X108.80 Y74.42 E2.63434

G1 X101.91 Y86.44 E2.70788

G1 X95.01 Y74.42 E2.78142

G1 X81.14 Y74.46 E2.85497

G1 X88.11 Y62.47 E2.92850

G1 X81.14 Y50.49 E3.00204

G1 X95.01 Y50.52 E3.07558

G0 F9000 X93.85 Y49.62

G0 X93.85 Y48.52

;TYPE:WALL-OUTER

G1 F600 X101.91 Y34.48 E3.16146

G1 X109.96 Y48.52 E3.24733

G1 X126.14 Y48.48 E3.33319

G1 X118.02 Y62.47 E3.41906

G1 X126.14 Y76.47 E3.50492

G1 X109.96 Y76.42 E3.59079

G1 X101.91 Y90.46 E3.67666

G1 X93.85 Y76.42 E3.76253

G1 X77.67 Y76.47 E3.84839

G1 X85.80 Y62.47 E3.93426

G1 X77.67 Y48.48 E4.02012

G1 X93.85 Y48.52 E4.10599

G0 F9000 X93.85 Y49.62

G0 X93.84 Y53.52

G0 X93.84 Y53.52 Z5.30

;End GCode

M104 S0 ;extruder heater off

M140 S0 ;heated bed heater off (if you have it)

G91 ;relative positioning

G1 E-1 F300 ;retract the filament a bit before lifting the nozzle, to release some of the pressure

G1 Z+0.5 E-5 X-20 Y-20 F9000 ;move Z up a bit and retract filament even more

G28 X0 Y0 ;move X/Y to min endstops, so the head is out of the way

M84 ;steppers off

G90 ;absolute positioning

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## ahoeben 1,948

At the ulti-evening I tried freezing my buildplate to make the nutella less droopy once printed. Should have used liquid nitrogen:

http://3dprint.com/9148/3d-printed-ice-cream/

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