Werner worm gear concept

Werner Berry’s Worm Gear Extruder Concept

By August 8, 2013. 3D Printers, Featured, Makers, News

Werner Berry, who has been working on his own 3D printer with a classical naming scheme – the BerryBot 3D – has shared a quite novel concept to extrude the filament, demonstrated with a humble screw on his Youtube channel. With Werner’s idea – fundamentally driven by the need to place the stepper motor vertically – the main difference to a standard set-up is to replace the conventional gear driving the filament with a screw, which then acts as a worm gear.

This approach has some advantages over the more traditional filament feeding solution: the functional part of the screw is completely and constantly attached to the filament compared with the standard design where only a couple of cogs are interacting with the filament at a single point in time – as illustrated in the screenshot below.

drive system comparison

Therefore the worm wheel creates more force and thus also doesn’t need to bite into the filament as hard – even though in Werner’s first proof of concept – demonstrated in the video below – the bite is actually quite hard, but it does prove his point of the potential of such a set-up.

The idea of using the worm gear set-up is not completely new in the world of filament driving, however,  as some commenting on Werner’s video  – and presumably some of you will as well – point out. One earlier example of a machine enabling the use of a worm gear was the Rapman BfBs where the screw, though an an angle, was also used. Despite previous examples in the history of RepRaps, a fully functional 3D printer with such a system – a precise, durable and easily swappable filament driving worm gear – is yet to be publicly seen. Also, fingers crossed for the absence of unnecessary patent disputes around this area, if a machine using this particular set-up ever does come out.

If you want to take a look at what else Werner has been up to with his BerryBot, head over to his YT channel.

  • Ralph

    It is interesting seeing the creative process from idea to prototype.

  • CncObsession

    I did this too even before Werner I believe. The video is on YT