I have released: Belted Extruder v4

Belted Extruder V.3 for 1.75mm

There are 3 versions here.
Two for m6 thread push-fittings (with and without support) and one for 1/8BSP thread.

I have made a Belted Extruder V.3 for 2.85mm as well.

If you are looking for a direct-drive (still geared with belt) I have made a Direct-Drive Belted Extruder 1,75mm V2 compatible with Prusa.

Brackets etc.
Everything for my Belted Extruders, including Mounting brackets can be found in the my Collection: Belted Extruders by Dintid.

• You do not have to open idler to load filament, which makes it very easy to change filament!
• Silent running due to belt operation
• Higher accuracy and longelevity due to aluminium gears instead of printed gears.
• Build in mount points on 3 sides. Compatible with standard Nema 17 brackets - 31mm mount hole distance from center to center.
• I have succesfully printed using Shore D40 and D60 Flexibles, where number denotes softness. Pure Ninjaflex (shore A 85) does not work due to bowden.
  * Read wiki: Shore durometer if interested.

Details

• I use a 60-GT2 aluminium pulley to avoid inaccuracies and avoid wear and tear of printed gear.
• I am using a 16-GT2 Pulley for my small gear, which gives a ratio of 1:3.75
• If you use a 20-GT2 Pulley for small gear you get ratio 1:3
• Belt needed 172mm/86 teeth - 188mm/94 teeth
• A Nema 17 motor - I use a small 0.9 steps pancake motor.
• Belt is tightened by sliding motor away.
• Strongly advice you to buy Hobbed Bolt from E3D - you can also buy it from Filastruder if that is easier for you.
• Push-Fitting with m6 thread
• With 32 microstepping and normal 1.8 degree Nema, the steps are about 1100mm/s filament, so ultra high definition and high torque

BOM

• 60GT-2 Pulley
• 16GT-2 or 20GT-2 Pulley
• E3D Hobbed Bolt - Hobb-Goblin-8mm-Shaft
• A belt with length between: 172-GT2 to 188-GT2.
• Note: 200-GT2 is too long.
• 2x m6 Push-Fitting for 1.75mm filament
• 2x 20mm steel springs. 1mm thick
• 2x m3 50mm (or longer) Partially Threaded Socket Head Cap screws
• 3x 608 bearings. 8x22x7 - Type doesn't matter.
• Various m3 nuts, screws and spacers

Nema 17 used
I am using Nema 17 "pancake" as in flat model.
Manufacturer Part Number: 17HM08-1204S
0.9deg Nema 17 Stepper Motor 1.2A 11Ncm/15.6oz.in 42x42x20mm
It's plenty to drive this, and I am currently using it to pull filament from a huge 2.3kg roll of filament.
You can ofcourse use bigger motors, but I rather like this model for it's compact size and great accuracy.
I found it on german ebay.