by Bender24601, published
I have got the OK to upload the drawings and other files needed to make this Extruder to the Universities' website. Not sure if in future I may upload the files to Thingiverse, but for now you can see most of the files here:
The list of files there isn't yet complete but I am working towards that. If I find time I may add a BOM and instructions as well, but for now I am very busy writing my thesis.
Newest tests are very promising in regards to consistent Diameter. Currently its 2.9mm so the Die diameter may be increased a tiny bit. Very little diameter variations can be measured at the moment. Any current variations are due to manipulation of the not yet solid filament.
Biggest drawback at the moment is the extrusion speed, which is still rather slow, but could easily be increased with a bigger motor. At the moment the motor spins at 35RPM and is extruding ABOUT 4cm per minute.
Feel free to ask questions in the comment section, if I have time I will try to answer these as soon as possible.
Update: Added a BOM in the downloads
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What are your recommendations for modifying this assembly to extrude a narrow sheet (~1.5" wide, 1mm thick), instead of a filament. Looking for recommendation on the die design
Hello Dolcey, Sorry If I step in right here but I may have some answers for you. I built an Extruder based on this one (just a little bigger). At first I used a stepper motor with about 1,3 Nm (Size Nema 34 company Portescap) of torque which wasn't sufficent (may have something to to with me using an extrusion screw and not an auger). So I added a gearbox with a translation of 20:1. The Maximum Speed of such Motor usually is about 200 Upm so with a Gearbox you get 10 Upm max.
I did a little math an calculated that this equals more than enough melted polymer for a theoretical extrusion rate (498 cm/min for a 1,75 mm Filament). I know this obviously won't happen but I'd be satisfied even with a tenth of that ;).
I sould mention, that my extruder still is partially under construction cause I hade to wait a long time for the gearbox. But I will assemble it this weekend.
For the temperature regulation I use a PID thermostat (from Eurotherm) (two actually for I use two heating zones) and heating bands with 240 Watts each (Company Niggeloh). Each thermostat is connected to a solid state relay which turns the line voltage for the heating bands on and of. These heating bands have a built in Thermocouple Type K also connect to the thermostat.
If you need certain values for your thermostat please tell me which one exactly. Also I trie to upload some pictures.
I hope I could help
Thanks in advance for your great contribution Bender24601.
I have reviewed all the material that you have uploaded, graphics and drawings, but I have problems with the connections of temperature regulating system and configuration, and what values ??should be saved, I also see that there is a control board engine, which also displays his connection, and finally, I'd appreciate more detail the components to buy or will update the links related to these components directly to the product in the bill of materials, as it would be suitable to find equivalents in other countries.
On the other hand, I have read that the speed could be improved by changing the Extrusion engine, which could recommend?
Thank you very much.
Sorry for the translation.
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