FRED3D printing on demand or inventory: comparing the costs
A cheaper part can cost more overall if half the batch stays on a shelf. To choose between 3D printing on demand and inventory production, compare total spending with a realistic number of sales. Start with this simple example, then add the costs for your own store.
In this article
What you pay before selling a batch
With a batch, you finance the parts before knowing actual sales. Depending on the process, include preparation, any tooling, inbound freight and storage. Not every form of batch production requires a mould.
Start with the total amount committed. Divide it by the number of parts actually sold during your chosen period. Keep a separate line for remaining inventory: it may sell later, be discounted or remain unsold.
What you pay with each order
With on-demand production, manufacturing spending follows confirmed orders. A FRED quote shows the cost of the chosen configuration, service fees, shipping and other applicable items. Its validity period matters when preparing a listing.
Add costs that exist in both models: design, samples, store operations, customer acquisition and after-sales support. Making to order reduces the need for finished inventory; it does not remove the launch budget.
An illustrative calculation, not a FRED price
Fictional assumptions, excluding tax: a batch of 200 parts at €5 each plus €200 in fixed costs totals €1,200. On-demand manufacturing costs €9 per sold part here, including service fees. Shipping, storage, acquisition and returns are excluded from both scenarios; add your actual amounts before deciding.
At 100 sales, the batch costs €1,200 and leaves 100 parts in stock, versus €900 on demand. At 200 sales, the batch still costs €1,200, versus €1,800 on demand. In this example alone, 1,200 ÷ 9 = 133.33: the batch becomes cheaper within this scope from 134 sales, but commits cash before the sales happen.
When should you consider holding inventory?
Repeat the calculation with conservative, central and high sales scenarios. If a batch only looks attractive in the most optimistic scenario, you are taking a risk on demand.
You can start on demand, observe sales and then price a batch for the most consistent variant. Less popular colours or sizes can remain made to order. There is no universal threshold in parts per month.
Compare the delivered product too
Both scenarios must serve the same customer need. Compare dimensions, finish, required strength, packaging and lead time. A printed part and a moulded part can have different characteristics.
Approve a sample of each option you are considering. FRED quality-control photos and tracking document the order; checking fitness for use remains a separate step. For environmental impact, also count unsold goods, scrap and transport.
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