My 1st attempt at a bow serving tool. Not yet printed so untested, but how hard can it be. It has its own printable spindle but its probably going to be impossible to print without support and take forever with so hopefully std ones will fit but I have no reference for size to measure.
Similar posts in my group http://www.thingiverse.com/groups/3d-toys

If you want to see more and how I create prints and 3D designs like this check out my YouTube channel. https://www.youtube.com/channel/UCSHUc93NXGwBacoIDDqPU2w

there are directional arrows on it to indicate which way to run the thread and then you can Google how to actually serve a bowstring. i will print this upright with the spool tabs at the top