Small Useful Tools № 001–002No signup. No paywall.

A small workbench for very specific problems

Less guesswork.
More making.

Practical little tools for the moment when the instructions leave you doing the maths.

01 / knitting

Yarn held together:
how many balls?

Untangle total versus per-strand quantities. See the working length, replacement yarn, and what you still need to buy.

Work out your yarn →
02 / 3D printing

Test the fit.
Then print the part.

Turn your measured peg diameter into a custom hole-clearance test STL. Find out what works with your own printer.

Make a fit ladder →

Free to use. Calculations and generated files stay in your browser. Optional feedback helps us find out what is actually useful.