Vertical Buffer Mount for Rear of (Un)Original Drybox v2

Updated (v2) - the first 2 photos show the original v1 model, and show how the buffer weight puts too much curve on the PTFE tubes to the MMU3.  Changes in v2:

• Angled the buffer mount so that the buffer-to-MMU3 PTFE tubes are vertical as they come out of the buffer, which reduces friction.  This assumes the buffer-to-MMU3 PTFE tubes exit the buffer on the left side, looking at the buffer from the front of the printer as mounted.

• Added an adjustable brace that holds the buffer away from the dry box so the PTFE feed straight at the entry hole for the enclosure.  This addresses the issue noted below under "Usage note"

• The enclosure mount is unchanged.

This model mounts the MMU3 buffer on the back of the drybox, and allows it to swivel slightly so that there is minimal strain on the PTFE tubes as they enter the enclosure.  This design has relatively short PTFE tubes (uses the original MMU3 tubes from the MMU3 to the buffer).

To load filament in the MMU3 you will require the loading fork.  Honestly, I would use this anyway because it makes the MMU3 loading so much easier!

PLA is used as a support top layer for the PETG print - the loading fork Printables page has a link to the tutorial for doing this.  Make sure to increase purging on the PLA-to-PETG changes (I used 250%!).  It should be easy to revert to only PETG if you desire.

Assembly requires

• (4) M3x30 bolts

• (4) M3x8 or longer bolts

I used variable layer heights to get smoother curves.  Only the "hook" overhang needs support on the buffer mount.  The horizontal bar in the enclosure mount should also have support.

I used a modifier block that encompassed the buffer mount "slot" to use 5 perimeters instead of my default 2, for added strength.

Use this model (https://www.printables.com/model/1180648-mmu3-buffer-mounts) as the buffer corners so the M3x30 bolts can securely hold the mount to the buffer.  You only need the 4 central ones but the 2 top ones can also be used if desired.

I also use this with my 4-position mounting rails (https://www.printables.com/model/1147987-unoriginal-drybox-slide-rail-mount-for-hinged-encl) so that the drybox can be easily removed from the lid of the enclosure.

Usage note:  I've found that the weight of the buffer overcomes the stiffness of the PTFE tubes, so I have wedged objects between the buffer and the drybox that hold it so the PTFE tubes enter the enclosure with no bending.  Definitely reduces the friction between the buffer and the MMU3.