Thingiverse
VM Extruder
par Vector_Mayhem
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After using a gregfrost extruder on my Prusa for a while, I decided I wanted to make a few tweaks to the basic design:
- replace the hobbed bolt (I found it too strip-prone) with a large-diameter filament driver that requires no machining
- a spring-loaded over-center latch on the idler arm, allowing opening the idler without unscrewing anything
- an idler arm that opens flat to provide even better access to inspect & clean the filament drive
After assembling it and running a few test parts, I put it to work building parts for sublime's printed lathe, around 45 hrs of runtime with 14 hrs for the longest single build, and didn't experience a single hiccup. I have since run it at up to 100mm/s, which it handles fine.
The extruder body has mounting provision for the Makergear hotend.
Zip file contains the Solidworks 2011 source files.
- replace the hobbed bolt (I found it too strip-prone) with a large-diameter filament driver that requires no machining
- a spring-loaded over-center latch on the idler arm, allowing opening the idler without unscrewing anything
- an idler arm that opens flat to provide even better access to inspect & clean the filament drive
After assembling it and running a few test parts, I put it to work building parts for sublime's printed lathe, around 45 hrs of runtime with 14 hrs for the longest single build, and didn't experience a single hiccup. I have since run it at up to 100mm/s, which it handles fine.
The extruder body has mounting provision for the Makergear hotend.
Zip file contains the Solidworks 2011 source files.
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