Qidi Cutter V2.0, for X-Max 3/X-Plus 3, uses 9mm Snap-off blades

This filament cutter was originally designed for the Qidi X-plus 3. Although I don't have an X Max 3, others have said it works perfectly. If you have the Smart 3 let me know if it fits.

No more disconnecting tubes and reaching for snips every time you need to change filament. Print it, snap off the end of a 9mm utility knife, insert the blade (carefully), and snap together. (You might want to put the button side against the table and give it a good tap) 

What's Needed:

1. 9mm snap off blade. No other hardware needed

What you need to know:

• For X-Plus 3 users, this cutter will become your new Y axis EndStop. In fluidd, go into printer.cfg and adjust the Y EndStop to -17. (This value might be different for the x-Smart 3)
• According to X-Max 3 users, the cutter does not touch the frame during homing, therefore you will not need to adjust the endstop.

• These are thin parts so you should use filament with high layer adhesion such as PC, PA, etc…  PETG, ASA or ABS will work but not recommended.
• I used PC-PBT for mine.
• Uses a 9mm snap off style blade. Break off the tip and insert into cutter.  Replacement blades are inexpensive and available everywhere.

• Use tree supports (build plate only).
• Printing at lower layer heights is beneficial, but 0.2mm works fine.
• Everything snaps together without any extra hardware or tools.
• If the tolerance is too loose on the blade, a drop of super glue will do the trick.
• STL files with tighter (Bambu tight!) tolerances around the blade are also available.
• Use pliers, don't cut yourself on these tiny blades!

Testing performed:

PC-PBT and PETG was used for testing. The springs were only tested in PC-PBT.

1.  Spring test (printed plastic springs): The push button was cycled 2,000 times, with no failure in the plastic springs or the rest of the assembly.
2.  Homing test: Performed over 150 homing cycles. Observed little to no wear on the end stop bumpers. PTFE tube remained solidly connected.
3.  Blade changes: Several assembly/disassembly cycles were performed with success, however, there was one breakage.  PETG samples broke every time during disassembly due to its lower interlayer adhesion.  In practice though, the blade may not need to be changed in a long time, if ever. (Depending what you print with) 
4. Printing Performance: There was no noticeable impact on printing performance with the cutter attached. I have not tested flexible filaments.

Considerations & Future versions:

The Qidi Cutter was meant to be solid enough to use as an automatic cutter. An additional “push block” can be mounted to the chassis (maybe on the far right side?) and with macros you can probably make it cut and purge the filament automatically, kinda like a Bambu P1P. I have not attempted this, but I'm sure it can be done. If you're good with macros and that sort of thing, you might be able to make it work for multi material applications, with an MMU3 for example.