TLDR Brad: I’d suggest you look at any customers with potential scale, who should have a custom SKU/BOM/order mix. 3D printing and full custom made to order products will have this mix, and it gets increasing painful when scaling past 100s of orders per month. One will find there will be in-house systems and workaround to deal with this complication, which should be fixed decently once a company is in the 1000s of orders per month by necessity of survival.
A bit more background as there is various bits of advice in these threads, and I will provide my take with scaling such a startup. Third-Party ERPs from the big vendors are purchased by Finance and are needed for validation pre-IPO and into the IPO (no one is going to trust something else without proof of success in publicly traded companies and it will be a red flag if there is no use cases in reputable publicly traded companies). ERPs are financial focused (like EHRs in healthcare), and their vendors will happily upsell the other addons like MES/BOMs, which are fine for generic manufacturing with limited SKUs. However in a world of customized/personalized SKUs, traditional ERP/finances solutions cannot be easily used to run manufacturing operations. I’d recommend focusing on integrating into ERPs (tack on custom IDs to the related objects) and automating them rather than building the full financial accounting/taxes into the platform. For example, your platform will still track the BOM details, but the totals will get synced for overall financial reporting for the various ledgers and not all the sub-assemblies which the ledgers don’t care about. This keeps the MES purpose built (and the big vendor ERP keeping simple books) and the ultimate source of truth what’s happening on the floor without getting into the accounting details that matter for tax optimization and not manufacturing operations.