drill holder
thingiverse
You can use this drill holder for a 0.4mm drill to keep your 0.4mm nozzle clean on your 3D printer. I use it with my Ultimaker 2 Extended. Instructions: Print with 100% infill. The hole for the drill is 0.5mm wide. I rewrote this model using a 0.4mm drill myself.
Download Model from thingiverse
With this file you will be able to print drill holder with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on drill holder.