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Every factual claim in this course traces to something here. If you find a source that contradicts a lesson, that is worth raising with your teaching agent — the lesson should change, or it should say why it disagrees.
Start here. The Onshape Learning Center is free with any account and is maintained by the people who ship the product.
WhySelf-paced course paths from first sketch through assemblies and drawings. The fundamentals path is a few hours and replaces a dozen scattered videos.
WhyDeliberately broken sketches for you to repair. The fastest route to actually understanding constraints rather than recognising their icons.
WhyThe reference. Short, exact pages per feature. Worth reading the one for any tool you use often — the options you never noticed are usually the useful ones.
WhyFive minutes on what constraints are for and how to find what is still loose in a sketch.
These are the sources behind every number on the design rules sheet. They disagree in places, which is deliberate reading — the disagreement is why you calibrate your own machine.
WhyThe best single page on the subject. Overhangs, bridging, pin diameters, base chamfers, with the physical reason for each. Written by a service bureau printing at volume.
WhyRules expressed as multiples of extrusion width rather than absolutes, which is the more transferable way to hold them. Quotes tighter clearances than most.
WhyWhere the 0.2–0.4 mm hole compensation and the 0.3 mm per-side clearance starting point in this course come from.
WhyThe press, slip and free fit ranges, plus a sensible method for tuning interference in small steps.
WhyA longer treatment of the one rule you will apply most often, including when modern printers and good cooling let you exceed it.
Model your own coupon if you want to practise variables. Download one of these if you just want the numbers today.
WhyPegs and holes at labelled offsets. Print once, keep forever, retest whenever you change filament.
WhyA long-standing community favourite covering more fit types in a single print.
The last third of this skill is not readable. It comes from showing a failed part to someone who has printed a thousand of them.
WhyUnusually high signal, and Onshape staff answer here. Post a link to your public document and people will open it and tell you exactly what you did wrong — which is only possible because the free plan is public.
WhyParts that do a job rather than parts that look nice. Closest community to this course’s mission, and good for sanity-checking whether an idea should be printed at all.
WhyLarge and general. Best for diagnosing a print that came out wrong when you cannot tell whether the cause is the model or the machine.
WhyCross-package modelling technique. Useful when your question is about approach rather than about which button to press.
Every claim on these pages links to its source. If a source looks wrong or out of date, check the resource list and tell your teaching agent — the course is meant to be corrected.