Edit:

• [20191023] Added the assembly instruction.
• [20240331] Not only Onshape users but everyone can now download models in any format.

This filament guide is suitable for most Creality printers where the filament reel is on top of the printer, always above the extruder. The guide moves up and down with the extruder feeder.
The advantage is that the filament is fed straight into the feeder without friction. This prevents the entrance hole from wearing out and breakage of the filament.

It is attached to two 'empty' holes in the feeder frame.

Assembly instruction:

1. Mount the groove pulley on the filament guide with the M5 nut and screw.
2. Press the two nuts firmly into the nut holder with a vise so that they can be placed in place more easily during assembly. Use extra glue when the nuts are not clamped tightly so that the nut holder is prevented to touch the aluminum profile during 3D printing.
3. Insert the filament guide and screw the left M4 screw into the nut while holding the nut in place with the nut holder. Ensure that there is sufficient clearance for the two M4 nuts between the extruder frame and the aluminum profile. Tighten the screw not too firmly so that the nut holder can be rotated with some friction.
4. Rotate the nut holder so that the right-hand nut is in position.
5. Install the second M4 screw and tighten both screws securely.

See also the pictures for assembly instruction and again, please pay attention that the M4 screws, nuts and nut holder do not touch the aluminum profile after assembly and during printing.

The BOM is:

3D-prints

• 1x Filament guide
• 1x Nut holder

COTS

• 2x Screw M4x12
• 2x Nut DIN 934 M4
• 1x Screw M5x16
• 1x Nut M5
• 1x U Groove Pulley Ball Bearings 5x24x7 mm (https://nl.aliexpress.com/item/33035211053.html?spm=a2g0o.detail.1000014.23.fc686356QMMg56&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.13338.177931.0&scm_id=1007.13338.177931.0&scm-url=1007.13338.177931.0&pvid=7c639f88-aedf-47be-a040-46bdfa188315&_t=gps-id:pcDetailBottomMoreOtherSeller,scm-url:1007.13338.177931.0,pvid:7c639f88-aedf-47be-a040-46bdfa188315,tpp_buckets:668%230%23208986%232_668%23888%233325%231_3338%230%23177931%230_3338%233142%239890%233_668%232846%238112%231997_668%232717%237562%23476_668%231000022185%231000066058%230_668%233422%2315392%23335).
  Of course it is also possible to 3D-print this groove pulley, but I think that the COTS-part is a cheap and more ruggedized solution.

Creality

CR-20

Doesn't Matter

Yes

0.2

20%

This part has been designed using the Onshape Free Plan.
Anyone can download models in the format of their choice, see image. Onshape users can also copy the Onshape models to their account and modify them. You can find the models here:

The Filament guide in Onshape

bit.ly/3d-eboek takes you to a free Dutch course eBook of Onshape, bit.ly/3d-boek to the hard copy.
Others can learn about Onshape at learn.onshape.com.