Sourcing
Moving a tool is the easy part. Moving the knowledge that made it run well, and keeping parts flowing while you do it, is where transitions go wrong. This playbook walks through both.
Why transitions fail
Most transition problems trace back to something that was never written down.
Teams change molders for good reasons: cost, capacity, quality problems, a supplier closing a line, or a move closer to the market. The decision is usually made on the commercial side. The risk sits on the technical side, because a mold that ran well in one shop is not guaranteed to run well in another.
A tool is tuned to a press, a set of process settings, a drying routine, and often a few undocumented habits of the people who ran it. Steel may have been adjusted over time to hit a dimension. Some of those adjustments are recorded and some live in memory. When the tool arrives at the new molder, everything that was not handed over has to be rediscovered, and that takes trial time and parts you may not have.
A good transition treats the move as a small launch. You protect supply first, collect the record second, check the tool third, and only then cut over, with approved samples as the reference the whole way through.
Before you announce the move
Once the current supplier knows, cooperation can change. Settle these first.
Confirm in the contract or invoices that you own the tool, and whether the mold base or any shared components belong to the supplier
Check what the terms say about releasing the tool, notice periods, and any unpaid balances that could hold it
Estimate how long the move, the trials, and any requalification will take, then add margin
Order a bridge stock of parts from the current supplier to cover that whole window
Keep a set of approved reference samples from the current production, labeled and stored on your side
Tell your own customers or quality team if the change needs their notification or approval
The handover package
Ask for all of it in writing. Anything missing is something the new molder will have to work out again.
| Item | Why it matters |
|---|---|
| Tool drawings and design files | Needed for maintenance, repairs, and making replacement inserts without reverse engineering |
| Process setup sheet | Temperatures, pressures, speeds, and times that produced approved parts. The fastest route to a stable first trial |
| Material specification | Exact resin grade, colorant method, drying conditions, and any regrind limit |
| Part drawing revision and inspection plan | Which dimensions are critical, how they are measured, and how often |
| Recent inspection data | Shows where each dimension actually sits in its tolerance, which tells the new molder where the margin is |
| Maintenance and repair history | Reveals worn areas, past damage, and steel changes made to hit dimensions |
| Spare inserts, fixtures, and gauges | Items bought for your part that are easy to forget in the crate |
| Hot runner and controller details | The new shop needs a compatible controller and wiring, or the tool cannot run as built |
The sequence
Each step has a clear exit condition before the next one starts.
Parts in hand to cover the move, the trials, and a buffer. Exit when the stock is received and checked.
Gather the handover package while the current supplier is still engaged. Exit when every item is received or confirmed missing.
Have the tool cleaned, photographed, and checked for damage and wear before it leaves. Exit with a written condition report.
Confirm press size, clamp, ejection, water, and hot runner hookups match the tool. Exit when the tool is mounted and runs dry.
Mold parts with the transferred settings, then measure against the drawing and the reference samples. Exit when parts match.
Complete any required approval, release the first production order, and keep some bridge stock until a few runs are stable.
A decision to make early
Transfer is not always the cheaper path once trial time and risk are counted.
Requalification
A new site is a change, even when the tool and resin are the same.
In regulated or contract driven industries, moving production to another site usually triggers a formal approval. That may mean a new first article inspection, a production part approval package, capability data on critical dimensions, or a customer sign off. Find out which applies before you set the schedule, because it often decides how much bridge stock you need.
Even without a formal requirement, treat the first runs at the new molder as a launch. Measure more often, keep the reference samples close, and compare dimensions to the historical data from the old supplier. Small shifts are normal after a move. What matters is that they are found and corrected before parts reach assembly.
FAQ
If you own the tool and have paid for it in full, the terms usually oblige the supplier to release it, sometimes after notice. Disputes tend to arise over unpaid balances, shared mold bases, or unclear ownership, which is why the contract check comes first.
Rarely on the very first shot. With a good setup sheet and reference samples, the new shop can usually reach matching parts after a short tuning trial. Without them, expect more trial rounds.
A cleaning and inspection before shipping is worth it, so you know its condition when it leaves. Major repairs are better agreed with the new molder, who will be responsible for running the tool afterward.
The new molder can develop a process from scratch, guided by the drawing and reference samples. It takes longer and uses more trial material, so allow extra time and bridge stock.
Keep reading
Before and after the move.
The questions to ask before you commit to a new supplier.
Buyer checklistOwnership terms and records that make a move possible.
Tooling IP protectionWhat a PPAP package contains and when it is required.
PPAPThe report that confirms parts match the drawing.
First article inspectionInspection and process control on parts in production.
Quality assuranceKeeping a single production tool running as volume grows.
One mold programNext step
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