MK4 Z-Axis “Anti-DustPresent”

Worried about dust getting into the Z Axis motors of your Prusa MK4? Here is another dust cover solution to choose from.

This design incorporates an O-ring to provide a small amount of friction to hold the dust cover in place. Even if you should need to tip your MK4 upside down, (and you will) it will stay in the Z motor brackets without falling out. Yet, with a little coaxing, it will pop right out.

And now…multiple versions

Unbuilt MK4
If you have yet to build your MK4, you may wish to print version DC-A which is a full circle disk. Add the O-ring to the disk and slide it down the Z motor drive shaft. Press the dust cover into the Z motor bracket center hole.

Already Assembled MK4
If you have already built your MK4 or purchased it assembled, then you may want to print version DC-B which is a split, half circle disk. (Print four, half disks.) Cut the O-ring open (not in half) and place it loosely around the two half disks which are already placed around the Z motor drive shaft. Press the dust cover and O-ring into the Z motor bracket hole. Your done. (Too bad you ate all your Haribo gummy bears.)

O-ring from Amazon.
https://www.amazon.com/gp/aw/d/B000FMYPKO?psc=1&ref=ppx_pop_mob_b_asin_title

Note;
I used the Amazon O-rings because I already had a bag of them from another project. However, if you want to fiddle with some TPU and make your own O-ring, I have included the dimensions of the O-ring below.

O-Ring size; 208 Buna-N O-ring, 70A Durometer, Black, 5/8" ID, 7/8" OD, 1/8" Width

-----------------------------

Update;
We have added 4 new versions to choose from.

At the request of a fellow Printables member, we created a PETG version that uses a 22 mm O.D. x 2.4 mm diameter O-ring.
 

*New* 22 mm O.D. x 2.4 mm diameter O-ring files;
“ECJ MK4 Z-Axis Dust Cover 22mm x 2.4 diameter O-ring”
“ECJ MK4 Z-Axis Dust Cover 22mm x 2.4 diameter O-ring split”
 

For the above versions, we used Prusament PETG with a .4 nozzle diameter. Layer height is .2 mm set for quality in Prusa Slicer. Infill set to 15%. No supports are needed.
 

*New* TPU Version
We also added a new TPU version that does not require an O-ring. If you have mastered working with TPU and you get good results, this may be a good fit for you too.

The files are;
RT MK4 Dust Cover TPU version
RT MK4 Dust Cover TPU version split

lf you decide to post a make, thank you!

Regards,
-Printium 3D

Today’s Acknowledgments; Thank you Eric @Eric_Recheck for your Mk4 Z axis debris cover. And sbuerger @sbuerger for your dust cover.