I learned from my previous prototype, and kicked out all its flaws.
It has two goals, you can easily switch to different nozzle sizes (0,5mm, 0.35mm, etc). So even if you buy your hot-end initially with 0.5mm nozzle size (seems like this will be the default, and other nozzles will come later), then you only need to replace a small nozzle:
Maybe in the future you can experiment with different inner structure for the least force required to push the plastic.
I think my filament is a pretty good testbed, as it has the worst coss section ever.
So me for example, I will constantly experiment with different nozzles, even after this hot-end design is sold.
Everything is screwed together, so no glue used, only a little firecement for the thermistor.
Also the nozzle is so small, that you can easily see inside, so you can clean it throughfully.
Trust me, I know how pita can it be, as I dealt with a pretty contaminated filament in the past.
6. Wire relief
My stock rapman hot-end sometimes has thermistor reading error during print, and the symptom is simply it prints without motor turning and the temperature is below few degrees of the target temp.
This hot end compatible (or will be) with any existing reprap and reprap-like machine. It is compact enough to achieve this.
For rapman you only need 3 additional disks (and also longer bolts) to achieve the same length as rapman stock hot-end, as this design by default is shorter with 12 mm.
Prusajr mendel variation
I worked with him on this, and his x-carriage can already accept my hot-end, see this git commit.
No additional stuffs needed.
I agreed with Kliment, that he will adapt this hot-end for Makerbot, and write an extensive article on it. Also I will provide adapter for it, if required.
Not decided yet sadly. Maybe prusajr will work on it, but no real commitment on it. So if you have one and want to work on it, contact me on order (at) arcol [dot] hu.
Also I'm already selling hobbed bolts for the drive mechanism.
So basically only RP parts (and a motor) required to have a working extruder.
Ok, its all great, but why is it a prototype?
So the final version should be done and tested before the end of this week.
Here is a 12 min long demonstration video:
If you are impatient fast-forward to 10:30.
This design turned out really great except a small flaw, but the next version will fix it.
Im intend to sell this hot-end for every possible machine.
If you are interested please drop me an email to .
The price will be between 40-50EUR depending how many people express his interests.
Payment as usual via paypal or wire transfer.
I hope you enjoyed this article, and stay tuned for the next (hopefully final) version!
This will simply turn the reprap world upside-down.