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00str00der Belt driven extruder

by iquizzle, published

00str00der Belt driven extruder by iquizzle May 6, 2013
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The 00str00der is a belt driven extruder designed via collaboration between myself and Terawatt Industries (http://store.terawattindustries.com/77-00str00der-belt-driven-extruder.html). The extruder can be made to work with a variety of printers. It is the standard extruder for the new PrismX 3d printer.

Here is a video of it in action on the PrismX: http://www.youtube.com/watch?v=_vMh1Gb-snw

The 00str00der is compatible with the kuehling x-carriage mounts via the included mounting adapter plate. OpenSCAD source files are available on github (https://github.com/iquizzle/00str00der). Pulley sizes are parametric so that any size can be used. There are options for mounting either a j-head or push-to-connect tube adapters for Bowden extrusion. "Standard" M8 hobbed bolts can be spaced to work with the 00str00der. Slotted motor mounts accommodate NEMA17 motors, and allow belt tensioning.

Parts can be self-sourced online, but kits will also be available through Terawatt Industries. For the moment, I recommend getting the parts you need by supporting their kickstarter campaign!


Required parts:

  • GT2 pulley - 5mm bore (16T standard, 36T bowden)*
  • GT2 pulley - 8mm bore (65T standard, 60T bowden)*
  • GT2 belt (88T standard, 94T bowden)*
  • other sizes can be used with custom openSCAD compilation
    -hobbed bolt
  • 608 bearings (I used 3x total, including the one for the wade's idler to properly space the hobbing, this could be different for you depending on where the hob is on your bolt)
  • M4x50 screws for clamping the M4 wade's idler
  • standard wade's hardware
  • 4mm x 1/8 NPT push-to-connect (bowden only)


  • Print off the 00str00der block that works with your choice of belt and pulleys (~1h on my MendelMax).
  • Drill/cut out the slot for the filament hole (2 solid layers by default for better printing)
  • Loosely mount the NEMA17 motor, attach small bore pulley
  • Place the hobbed bolt in the bolt hole with 608 bearings on either side, use spacers to line up the hobbing as necessary.
  • Clamp the large bore pulley onto the hobbed bolt
  • Put the belt onto the pulleys and push the motor back in the slot to tension the belt

I may do some more experimentation with gearing ratios for the bowden setup. I will continue to add STLs here and update code on github as improvements are made. For now, I'm listing this as a work in progress. The design has been tested and it is working great, but it may need a few tweaks before I'm ready to call it a done deal.

Enjoy! :)

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The Terawattindustries website has been down for the past couple days. Hopefully it'll be back up soon.

Are the original CAD files available in Solidworks format if we'd like to remix this design?

The original files are in OpenSCAD -- you can get them from here: https://github.com/iquizzle/00str00derhttps://github.com/iquizzle/00...

I pulled the files from github, but I'm having some problems:
I tried importing the .STL's into soldiworks, and it's reporting multiple errors which I am unable to resolve. So, I opened the 00str00der.scad file, and I'm unable to compile & render it- it always hangs up at "380/1000". Any suggestions? Thanks!

Sorry you're having problems. It will compile, you just have to be patient. It takes a really long time for some reason.. I'll see if there are changes that I can make to the code so that it compiles faster.

I'll try it again tonight, thanks for the help.

Great, thanks!

does anyone have a source where I can buy the belt for this?

Looks good. Want to use one on my Delta with a bowden setup.
Do you think I need to put a fan on the stepper?

I use the bowden setup with my h-bot.. but I'm just finishing it and have only tested a few ~1h prints. My stepper didn't get hot on those tests, but I'd need more time before I could say for sure. It's ~2:1 gearing, so it shouldn't get nearly as hot as direct drive, but I need another week or so before I could say for sure.

No noise, no wearing of gears, no backlash, gearing build in.

What's the benefit to the pulley design over a geared design?

Well, I've been using the herringbone gears. I think they work pretty well, but the belt drive improves some things.. of course it's also a few bucks extra for parts, but I think a worthwhile upgrade.

Here's a list of a few ways I think this improves things:

  • gears don't wear out

  • backlash-free

  • smoother operation

  • easier to tightly clamp gt2 pulleys onto the motor shaft

  • less friction

The prints in the video on kickstarter is no way near the speeds it says in the texts. I'm sure you think it is, but either the acceleration is very slow, so it never reaches target speed, or some max parameter roof is hit (like max speed on the extruder)

It's not my project, so I really can't say. I have seen it running and it is significantly faster than I can run my MendelMax. Also, I've run my H-Bot at 600% of "stock" speeds without hitting any max parameters, so I guess I don't find it that hard to believe. It's kinematically very simple to calculate the time it takes to reach a certain speed with a given acceleration and jerk. I'd suggest crunching a few numbers to see if it's reasonable.

In any case, I'm not going to make any claims about it because only the extruder is mine. Regardless of how fast the PrismX is actually printing, I know it's quite fast from my own experience, and that's about all I can really tell you. I'm just helping out a friend, because he's a nice guy and I think he's made a excellent printer. :)