Today’s activities

Today we will be focusing on setting up the outline for the paper we have to hand in in a couple of weeks. To do this, our goal is to make a plan for this project as good as possible, including milestones and detailed planning. We will use the checkpoints to be found HERE for our paper.

We also had contact with Adrian Bowyer, founding father of the RepRap project. Since he already looked into the subject of a granule extruder (see here: he gave us some tips and advice. We also added this blog to the RepRap Blog of Blogs (, a collection of all RepRap related RSS feeds.


14 Responses to “Today’s activities”

  1. Erik de Bruijn Says:

    Did you decide you wanted to create a direct extruder that uses granules or do you want to recreate the filament and use that in the regular mechanism? (or perhaps an entirely different route…)

  2. reprapdelft Says:

    We’re leaving all options open at the moment. We are first looking at different ways of extruding. It seems to us that the way of granule extruding that mr. Bowyer used may seem the most logical, but that it may not be the best option (process-wise, with a screw). On the other hand, in the RepRap philosophy the solution has to be as cheap as possible and accessible to everyone. That’s the consideration at the moment.

  3. aka47 Says:

    I have done a little reading on this and have the idea that a piston type extruder with a heated nozzle and cooling block misght work quite well to extrude a filament.

    The cooling block will probably need a brake assembly on the outlet so that the extruded but cold filament can be held in place as the piston assembly is refilled. That is is you wanted a longer contiuous filament.

    Don’t know if this is of any help to you or more of a hinderance.

    I am looking forward to seeing the papers you publish, anychance of having a PDF copy of the journal print when you get there ??



  4. Ervin Sholpnick Says:

    I like beans

  5. aka47 Says:


    What sort of blade/chopping/cutting thing did the plastic chipper you saw have in it ??

  6. aka47 Says:

    Just thought I should mention that there is a bit of a thread on this just starting up on the RepRap Forum,34188

  7. reprapdelft Says:

    @ aka47

    Thank you for your comments. We read on the forum topic (yes, we had already seen it) that you thought we have a plastics shredder on campus. This is true, but it’s an industrial type. Think large machine, a lot of noise and boom, granule. So it’s good to use in our research, but not for domestic use/RepRap. I’ll see if we can answer your blade type question.

    We will take your thoughts with us in our process. PDF paper will be published here of course.

  8. Ed Foster Says:

    I have copied your idea and used a 24mm wood auiger fitted inside a 26mm metal pipe. I fitted a loading hopper and a electric drill placed in revers so that it turned to auger to the left and feeds plastic granules effectively. I used a propane gas torch to heat the barrel about 100mm and turned on the power. The extrusion was a little lumpy at first but soon settled into a steady extrudate 3mm thick x 26 mm wide. I used ABS pellets. Now Im going to add 2 more similar extruders in a “Y” configeration so that I can increase the output into a 75mm pipe to present a much larger extrudite.

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