Knot Tender
thingiverse
I crafted this device for a buddy of mine who utilizes it for scaling trees. Its inner workings are unclear to me, but here it is - use with caution.
Download Model from thingiverse
With this file you will be able to print Knot Tender 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 Knot Tender.