EXHAUST HOSE ATTACHMENT

The K2 can print exotic materials, but I don't trust the included carbon filter/air cleaner to remove all of the harmful fumes. This allows you to attach a 3 or 4-inch hose to pipe the fumes out a nearby window or vent. Much safer when printing ABS, ASA, and even 'safe' materials that still put a lot of particulates into the air.

As shown in the annotated image, the attachment plate and hose nipple are connected to the back of the K2 via the two screws that hold the external spool holder and the left side screw of the poop chute. The included screws should be fine if you don't attach the spool holder. If you use the external spool holder, attach the hose plate and nipple first, then the spool holder on top of it. This will give the exhaust hose plate a better 'seal' to the back of the printer. If you use both, consider replacing the existing M4 screws with screws that are 2-4mm longer for better holding of the spool holder.

WINDOW ATTACHMENT

A 3-inch window plate hose attachment is included. Scale it up to 133% in the slicer to fit a 4-inch hose. It has screw holes at the corners for mounting to a wall vent, or a wood or corrugated plastic strip with a vent hole that can be placed in a partially open window to provide for venting during printing.

EXHAUST HOSE

I used this exhaust hose. https://www.amazon.com/dp/B07QK6FVNX

The linked exhaust hose has decent construction with a foil inside layer and a rubberized outside layer, and a metal spiral wire to keep its shape. It comes with two hose clamps that work well with these ducts for mounting the ends of the hose to the printer and window (or wall).

PRINTING NOTES

I printed mine with PETG. It takes a little more heat than PLA and doesn't 'creep' over time like PLA.

K2 or K2 Combo Exhaust Hose Attachment for 4 or 3-inch hose

0.2mm layer, 2 walls, 15% infill

0.2mm layer, 2 walls, 15% infill