As I was fighting with my current rather badly designed extruder I was thinking of ways to improve it. Hitting it with a hammer a few million times was at the top of my list. But right below that was increasing the amount of surface of the hobbed bolt/drive gear touching the filament. I thought of a wood screw right away and then dug around and found out that someone else had already thought of it. [reprap.org]. But the wiki entry is just a stub with no real details or plans. Does anyone know anything about the state of this project? Thanks Mike https://reprap.org/forum/read.php?4,403897,403897#msg-403897 Mon, 16 Mar 2026 11:51:24 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?4,403897,404157#msg-404157 https://reprap.org/forum/read.php?4,403897,404157#msg-404157 Trying to slide the filament past whatever drives it is a challenge. The other issue I ran into is that it twists the filament as it spins. While not an issue between the extruder and hot end really, it is a problem for spools, where it causes a rats nest.

Frankly, after lots of testing, wild contraptions, and having nothing but problems, I've come to the conclusion that geared extruders stink. The geared stepper motor setups are just a lot easier to deal with, no worries about gears failing, no noise... It's just dead simple, leaving all hassles confined to finding a good hobb. Find the right hobb and all is well. Geared steppers aren't cheap, but considering how much hassle I was having with extruders, it was worth every penny.]]> sheepdog43 Reprappers Sat, 06 Sep 2014 16:58:10 -0400 https://reprap.org/forum/read.php?4,403897,404099#msg-404099 https://reprap.org/forum/read.php?4,403897,404099#msg-404099 Screw/ Worm Drive Filament Extruder]]> Evil Monkey Reprappers Sat, 06 Sep 2014 13:55:14 -0400 https://reprap.org/forum/read.php?4,403897,403906#msg-403906 https://reprap.org/forum/read.php?4,403897,403906#msg-403906
on the other hand if you want to develop a new idea. i have something in the back of my mind with 2 hobbed bolts for maximum surface on 1 motor. leave me a pm if you´re interested]]> sungod3k Reprappers Sat, 06 Sep 2014 00:23:16 -0400 https://reprap.org/forum/read.php?4,403897,403897#msg-403897 https://reprap.org/forum/read.php?4,403897,403897#msg-403897 reprap.org]. But the wiki entry is just a stub with no real details or plans. Does anyone know anything about the state of this project?

Thanks Mike]]> Miertam Reprappers Fri, 05 Sep 2014 22:43:41 -0400