To see this working, head to your live site.

Edited: Apr 13

3D UnderClippy (A new concept?)

Update: I've updated the Printables project to Version 2. I've made a number of improvements and also supplied sample gcode to use it.

I've. been working on this for a couple of weeks. My idea was to locate the clippy under the extruder and above the hot-end. This would require shaping of the filament before retracting into the heatsync. Then cutting and extracting the old filiment before loading the new filament to push out the remaning piece of the old filiment. This design allows positioning the lever to any corner without obstructions. It uses 3mm x 10 springs to manage the plunger. I have printed and tested this, but haven't figured out a triggering lever for it yet.

Update: I've added photos of the prototype at the bottom.

Orbiter Version installed:

Top view:

Internal mechanism (top view):

Bottom view:

Internal mechanism (bottom view):

Because of my current setup, I could only place the lever on the left front. I'm in the process of printing new mounting to allow the lever to be at the rear-right for easier configuration.

14 comments

14 Comments

las_vegas

Mar 31

UPDATE! I have published the design on Printables! Let me know if you build your own!

https://www.printables.com/model/826577-3d-underclippy-filament-cutter-for-3dchameleon

Joseph E

Apr 01

Replying to

Took what you had and made a quick mockup for a BMG mount. Will do some printing tonight and see how close I got. At work right now.

las_vegas

Apr 07

Replying to

I'm curious how your BMG mount is coming along. I imagine that your incorporating the UnderClippy into one of the BMG sides?

Joseph E

Apr 07

Replying to

Sorry, Work stuff and allergies (East Texas pollen) has slowed me down a bit. What printing that I have done, it was just some stuff to test the Chameleon. Was successful, So I'm pretty happy.

As far as the BMG mount goes, trying to keep it modular and easy to print.

las_vegas

Mar 28

I've made progress on the UnderClippy. I now have a lever that works when the gantry is advanced to X260!

My tests show that with my Orbiter extruder, The filiment gets cut 25mm from the extruder gear. It's 90mm to the nozzle. I figure if the filament is extracted 50mm before cutting, there should only be about 15mm of wasted filament.

Now I need to devise a script to shape the tip, extract and cut.

Edited

Joseph E

Mar 29

Replying to

Forgot to mention that my Clippy is somewhat modified to give a deeper cut. I'll post that as a remix to Bill's as soon as I rework the arm a bit. Right now I'm running with a piece of bowden tube taped to the arm. 😎

las_vegas

Apr 01

Replying to

This is my untested script for the 3D UnderClippy, loosely based on Bill's original 3DClippy profile. I expect it'll work, but I"m still stuggling with other issues of digitally sending commands to the 3D Chameleon. Once that's working, I'll add this script.

3D UnderClippy Right Trigger Code @ X260:

G91 ; set motions to relative mode

G0 E-50 ; Retract filament 50 of 65mm

G0 X230 F2000 ; Start Point For cutting

M92 X8 ; Set X steps to 1/10th (high torque)
G92 X0 ; Set X to 0

; cut off filament tip
G0 X300 F10000 ; Cut the filament quickly
G0 X-300 F10000 ; Move X back to position.

M92 X80 ; Restore X steps
G92 X230 ; Restore X position

G0 E5 F10000 ; Push cut filament past the cutter.
G0 E-35 F10000 ; Total back out of 90mm (+5)

; Filament ready to be changed.

3D UnderClippy Left Trigger Code @ X0:

G91 ; set motions to relative mode

G0 E-50 ; Retract filament 50 of 65mm

G0 X30 F2000 ; Start Point For cutting

M92 X8 ; Set X steps to 1/10th (high torque)
G92 X300 ; Set X to move far

; cut off filament tip
G0 X-300 F10000 ; Cut the filament quickly
G0 X300 F10000 ; Move X back to position.

M92 X80 ; Restore X steps
G92 X30 ; Restore X position

G0 E5 F10000 ; Push cut filament past the cutter.
G0 E-35 F10000 ; Total back out of 90mm (+5)

; Filament ready to be changed.

las_vegas

Apr 05

Replying to

Well… This script works, but it doesn't work. It cuts the filament fine, but fails to move back to X230. I don't know what's going on with the code. I guess I'll have to write a little g-code script to put it through it's paces.

Also, a very strange thing! Having changed the X-steps, using it and then changing it back, PrusaSlicer, after slicing, shows the print moving out of the bed 300mm on every layer. Perhaps that's related to X not retracting again. Hmmm?!?!

Bill

Mar 14

Nice!