Draw the part you need with the dimensions written on it, photograph the sketch, answer a few questions, and get a verified, printable model you can look at in AR before it goes on the bed.
partl reads your sketch and asks the questions a machinist would ask before cutting metal. Only once it is confident does it design the part, and then every model is run through a deterministic check: it has to produce a single watertight solid that fits on a real bed. If it does not, partl tells you what failed rather than handing you a file that will not print.
Five parts a month, designed in batches and delivered as 3MF, the one file a printer actually needs. If verification fails, partl tries one automatic repair.
Skip the queue, 15 parts a month designed by the flagship model, up to three automatic repair rounds when verification fails, and STL and STEP exports.