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u/sambeauch

r/InjectionMolding
Image 1 — Supplier flagged multiple heat shrink mark risks in DFM — what's the actual effect?
Image 2 — Supplier flagged multiple heat shrink mark risks in DFM — what's the actual effect?
Image 3 — Supplier flagged multiple heat shrink mark risks in DFM — what's the actual effect?
Image 4 — Supplier flagged multiple heat shrink mark risks in DFM — what's the actual effect?
Image 5 — Supplier flagged multiple heat shrink mark risks in DFM — what's the actual effect?
Image 6 — Supplier flagged multiple heat shrink mark risks in DFM — what's the actual effect?
Image 7 — Supplier flagged multiple heat shrink mark risks in DFM — what's the actual effect?
Image 8 — Supplier flagged multiple heat shrink mark risks in DFM — what's the actual effect?
Image 9 — Supplier flagged multiple heat shrink mark risks in DFM — what's the actual effect?
Image 10 — Supplier flagged multiple heat shrink mark risks in DFM — what's the actual effect?
Image 11 — Supplier flagged multiple heat shrink mark risks in DFM — what's the actual effect?
▲ 6 r/InjectionMolding

Supplier flagged multiple heat shrink mark risks in DFM — what's the actual effect?

I am a complete beginner in injection molding and I am looking to manufacture my first part.

My mold supplier sent back a DFM report with several areas flagged in red for heat shrink mark risk (see image).

My part is a functional component used in a manufacturing plan — zero aesthetic requirements. No one will ever see it. I only care about dimensional accuracy and mechanical performance.

Information:

  • The thickness on the right of the picture is 10mm.
  • The thicker part on the left is 13mm.
  • Info from vendor:
    • Cavity: 1+1
    • Mould Type: Cold Runner
    • Mould Base: S50C
    • Cavity and Core: P20
    • Material: POM/PPS (But I haven't decided on material yet; I might go with PVC or PP)

My question: For those of you with hands-on experience — do heat shrink marks actually affect geometry/dimensions, or is it purely a cosmetic issue? Should I be concerned about the red zones in the DFM report? Does is indicate a problem, or is it supplier covering his ass?

u/sambeauch — 6 days ago