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Hi Martin, That's a great looking extruder. It looks like the drive gears share a similar design to the MK8 RepRap drive gear, which I have found gives really good grip without deforming the filament very much. On the 3mm variant, what do you feel is the compatible range of...
aviphysics replied to topic:
I think my budget would top out at about $130. Also, while I will definitely need a good extruder for large prints in the next year, I won't be needing one right away.One question. What is the compatible range of filament sizes?
I got some used ones off of ebay.
Preview of my upcoming more compact Nema 8 design. I am still working out some interference issues with the Nema 8 mounting screws.http://i.imgur.com/rEAG5l1.pnghttp://i.imgur.com/z7nbw6Q.pnghttp://i.imgur.com/8GlNeKx.png
1) The print head is lighter, because there isn't a fan on it.2) The print head is smaller, because there isn't a fan on it.3) Maybe this is just me, but I found my overhangs with the crossflow fan were substantially better than the results I was getting with the UMO stock fan an...
Posted my final design for this version on Youmagine.https://www.youmagine.com/designs/nema-8-worm-gear-print-head-redux-for-foehnsturm-modular-printheadhttp://i.imgur.com/Kc5RVAw.jpgAlso working on a more substantially different version with lower center of mass.
But they don't have to move with the hot end, so weight isn't such a big deal.
Look up "Crossflow Fan". These fans produce a sheet of air, so you can have one on the side of the printer blowing across the entire top of your print.
One thing I didn't expect with the Nema 8 design is that it is way quieter than the UMO stock extruder. I am guessing that is due to the increase in step frequency and decoupling from the wooden frame.