Filament Splicer
thingiverse
If your Mk7 only accommodates 1.75mm filament, consider creating a converter for your 3mm material; however, this might require ample time, which you may not have at present. The Mk7 features PCB heaters that melt plastic between three metal layers on top of the device.
Download Model from thingiverse
With this file you will be able to print Filament Splicer 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 Filament Splicer.