Top-mounted filament thru-port for Prusa Lack Enclosure V2.

prusaprinters

There are many filament thru-ports for the classic Lack 3d printer enclosure, but this one is mine. When I built my Lack enclosure, I cut up the top of my enclosure to make space for the MMU2, but never actually installed the MMU2.  Because of this, I just need my filament port to go through the thin top layer of the table top.  That's what my design does.  This design supports 1.75mm filament, and you'll need a short length of PTFE tubing to complete the design.  Cut a 22mm length of PTFE tubing and insert it firmly but carefully so that about 1mm sticks out on either end.  I have found this minimizes friction and noise.Design notesThis filament port is designed to go through a 1/4" hole, which was as small as I could get it to work. This does mean the bolt is somewhat delicate, so do *not* overtighten as this will almost certainly snap the bolt portion off.Tolerances are very small, so I recommend using a 0.4mm nozzle with 0.1mm layer height. I recommend printing at a relatively slow speed.If you heat your enclosure, make sure the parts are printed in a material that will hold up to the temperatures.  Since this part will be located at the very top of the enclosure, it is subject to the highest temperatures.If this doesn't fit your brand of PTFE tubing, try scaling up or down in 1% increments.The port may seem to be longer than necessary at first glance.  I found that the friction provided by a long bolt grips the PTFE tube well enough that it will stay in place without any additional glue.Good luck, and I'd love to see your prints!