Greg's Wade Accessible Belt Drive Extruder, Rev2

This is a mash-up of the Greg's Wade extruder and Terawatt Industry's belt drive extruder. It brings the zero backlash advantages of the Terawatt 00str00der design together with a heavy duty, rock solid design.
Note: this is designed for 3mm filament.
I've included the solidworks files for the frame and assembly. You'll have to download the remainder of the solidworks files from the original version of the extruder if you want to fully edit the assembly
This is a remixed version of the original: http://www.thingiverse.com/thing:185269
Updates:
-Beefier main frame to avoid cracking around bearings
-Accommodates 2x 608 bearings on the non-drive side of the hobbed bolt for extra stability
-improved nut traps for M4 mounting nuts
-improved stepper mounting plate

2015.10.27 update:
-I added files for the idler- NITEWING76 was kind enough to send me the files for inclusion in this package.

2014.10.01 Update:
-Updated 1.75mm version to allow for more compression of the filament. Also updated the Solidworks .prt file.

2014.09.23 Update:
-Added 1.75mm filament version. I'm not sure if there will still be enough clamping distance available with the idler- if someone tries it, and it works (or doesn't work) please let me know.
-Updated the solidworks part file- it now includes two configurations, the default 3mm and a 1.75mm version.

Print instructions

Category: 3D Printer Extruders Instructions

Components Required:
65T plastic (carbide) GT2 pulley w/8mm bore, flanges, set-screw
17T aluminum GT2 pulley w/5mm bore, flanges, set-screw
GT2 belt, 2mm pitch, 88T, 196mm length, 6mm-with, fiberglass-reinforced, closed-loop
Pulleys and belt can be sourced from stock drive products, Terawatt industries, ebay, etc.
Hobbed Bolt
608 bearings, 4 minimum (3x for hobbed bolt, 1x for idler)
2x M4 x 55 SHCS
2x springs
1x M8 axle or stud for idler pulley
4x M3 SHCS for stepper mount
4x M3 washers for stepper mount
misc other M3 / M4 hardware
Assemble as normal for Greg's style extruder. Use the slots in the stepper mount to tension the belt. Be sure to recalibrate your E steps after installation. You may also have to reverse the direction of your extruder stepper in your firmware. (I did)
Enjoy quieter, backlash-free printing!