The nameplate on the new conveyor carries the name of a different company. The customer spots it a week after delivery, and nobody in engineering ever typed that name in. It traveled along in the iProperties of a copied frame, neatly filled the customer field in the title block, and slipped past every check unseen. The machine itself is flawless; the phone call about it is awkward all the same.
This happens more often than we admit, because to copy an Inventor design for reuse is the fastest way to start a new project. The geometry is proven, the structure familiar, the drawing mostly done. But you copy more than geometry: outdated metadata, leftover sketches, broken references and assumptions from the previous order travel along for free. With a fixed routine, and a toolbox like Thundercad for the cleanup and update work, you keep the speed of reuse without spreading the old mistakes.
This article is about ad-hoc reuse: taking an earlier order as the starting point for a new one. You will read what to copy and what never to take along, what the cleanup right after copying looks like, and how to update metadata in bulk instead of file by file.
What quietly travels along with a copy
Copying feels like a fresh start with a head start, but a copied assembly is not a blank sheet. It carries a complete history that has nothing to do with the new order. The most persistent stowaways:
- iProperties holding the customer name, order number, project code and status of the previous order, up to and including "released";
- leftover geometry: helper sketches, unused work planes, suppressed features and imported reference models that were once needed "just for a minute";
- references to files outside the project folder, which only break once a colleague opens the assembly;
- notes on drawing sheets about agreements that only applied to the previous customer, such as a special coating or non-standard packaging.
Each of these stowaways is small on its own. Together they make sure that a mistake that was fixed long ago, or an agreement that no longer applies, resurfaces later in a project where nobody expects it. And because the copy looks like a familiar, proven model from the outside, nobody gives it a critical look anymore.
What you copy, and what you never take along
A good copy starts at the source. Always copy from the last released version, never from a colleague's working folder: that is where half-finished changes live that nobody remembers the state of. Then deliberately take along only what has value for the new order.
Do copy: the parametric setup, proven parts and assemblies, and the associated drawing set as the basis for the new one. Never take along: old export files such as PDFs and STEPs sitting in the project folder, order documents from the previous customer, and loose files that were once parked next to the project. Those belong to the old order and pollute the new folder from day one.
The cleanup: right after copying, not someday
The best moment to clean a copy is right after copying, before the first real change. At that point you still know exactly where everything came from, and there is no new information you could accidentally wipe along with the old. Postpone it and it never happens: as soon as the first deadline approaches, cleanup is the first thing to go. A workable order:
- First rename all files to the numbers of the new project, before changing anything.
- Walk the assembly tree and delete what the new order does not need. Do not suppress things "for later": gone is gone, the original still lives in the old project.
- Clean the modeling clutter per part. With Model Cleaner from Thundercad you remove leftover geometry and junk in one operation, instead of digging through every part by hand.
- Check that every reference points to the new project folder and no path leads back to the old order.
- Open every drawing and go over the title block, notes and dimensions for remnants of the previous customer.
Run these five steps as a fixed ritual and the copy starts behaving like a new project: predictable, clean and free of surprises from an order that was closed long ago.
Going through every copied part by hand is exactly the work that gets dropped under deadline pressure. Thundercad automates the cleanup and the metadata updates, straight from Inventor.
Try 30 days freeMetadata: the invisible passenger
Of everything that travels along, metadata is the most dangerous, because you never see it in the 3D window. iProperties drive title blocks, BOMs and exports to your ERP. If an old customer name or project code stays behind, it will surface on an official document sooner or later, like the nameplate from the introduction.
Updating file by file is error-prone: in an assembly of sixty parts you are guaranteed to miss a few, and those few are exactly the ones that float to the surface. With the Assembly iProp Menu you update the iProperties of a complete assembly in bulk: customer name, project, order number and status are entered once and every underlying file follows. While you are at it, deliberately set the status back to concept, because nobody has checked a copied model yet, whatever the old stamp claims.
How to run such a bulk update, also outside of reuse, is covered in Updating the metadata of a complete assembly in one pass.
When ad-hoc reuse is no longer enough
The routine above is meant for occasional reuse: an order that resembles an earlier one, a frame you build now and then in different sizes. If you find yourself copying the same machine every few weeks, dozens of near-identical copies appear and nobody knows which version is the best starting point, then you are ready for structural variant management, with a master model and deliberate branches. That is a different story with different tooling; we wrote about it earlier in Managing variants and customer specials without the sprawl.
Until then: reuse freely, but treat every copy as suspect until proven clean. First a tidy model, correct metadata and fresh references; only then start designing.
Frequently asked questions
Can the drawing come along with the copy, or should I rebuild it?
Take the drawing along by all means, there is a lot of work in it. Just treat it as part of the cleanup: check the title block, the notes, and any dimensioning that depended on agreements with the previous customer. Rebuilding a drawing costs hours; critically reviewing one costs fifteen minutes.
How do I avoid broken references after copying?
Never copy loose files through the file browser; use Pack and Go or the copy function in Vault. Both take the complete reference structure along and let you rename files on the way. Afterwards, open the assembly once to confirm no messages about missing files appear.
How much time does this routine cost per copied project?
As an assumption, count on half an hour to an hour for an average assembly, mostly for reviewing the drawing set. The cleanup and the updates themselves take minutes with Model Cleaner and the Assembly iProp Menu. Try it on a copy of your own during the free trial month of Thundercad: 30 days free.