How do I quote overmolding or two-shot?

Upload one CAD revision that shows the substrate and the second-shot volume. Name both resin families, mark bond faces and keep-off shutoffs, and say whether the substrate is molded here or supplied. Use the instant quote platform so DFM review sees the same package.

Can I upload only the finished outer shape?

No. A single outer solid hides the second-shot volume, the shutoff land, and the keep-off faces. Review cannot assign a resin family to a volume that is not in the file. Export both bodies, or clearly named bodies, on the same revision.

Do I have to pick two-shot before I upload?

No. You can write open to DFM on route and still upload both volumes. Use the compare page and the two-shot versus sequential article when the team needs a route first. The quote can start without a locked process name if the solids and families are present.

What if the second material is LSR?

Write LSR as the skin family and mark the LSR volume on the same revision. LSR overmolding is in scope when you name it on the RFQ. Soft rubber or silicone-like is not a family and leaves the skin as a guess.

What if my overmolding quote needs multiple second-shot volumes with different functions?

List each function separately. A TPE seal in a groove and a TPE grip on the side are two lines even when both are TPE. If two skins use different families, name both. A second function without a second volume is an incomplete package.

Do I need to specify bond strength or peel targets in the quote?

Not in the first quote field. Put retention requirement language on the RFQ, such as bond test verified at FAI, but do not invent load figures in the notes. The quote should say whether bond testing and records are in scope. The numeric acceptance limit belongs on a later quality line.

What if the substrate already exists from another shop?

Write customer-supplied substrate on the RFQ and send the incoming part as the substrate definition. Mark incoming faces, keep-off on existing texture or print, and treat it as a sequential overmold. Do not fuse it into a finished-shape solid and call it two-shot.

How to Quote Overmolding or Two-Shot

A Single-Body Upload Is Not an Overmolding Quote

Quote overmolding or two-shot by uploading one CAD revision with substrate and second-shot bodies. Name both resin families, mark bond and keep-off faces, and state supply source. Post-install is a separate line. Overmold is a second material.

Read overmolding process for the process page. This page only covers the RFQ package that sits next to the CAD upload.

The second-shot volume is part of the tool plan, not a later email

A single outer solid hides the second-shot volume, the shutoff land, and the keep-off faces. If you upload one solid in one color, the engine can price a single-material part. It cannot invent a second-shot volume from a filename.

Resin family must be written: ABS, TPE, LSR, not soft

TPE later in email is not a second body. LSR grip without a marked volume is not a skin. Write the second shot as geometry and as a named family. LSR overmolding is in scope when you name it. Soft rubber or silicone-like is not a family.

A worked example: a handheld enclosure needs a rigid ABS body and a TPE grip in the left and right recesses. Export a revision that contains the ABS body and the TPE volumes as separate solids or as clearly named bodies. Name ABS and the TPE family. Mark the recess walls as bond faces and the logo pad as keep-off.

What the Package Must Contain

Finished-part CAD with substrate and second-shot bodies

The substrate is the first-shot body. It carries structure, snaps, bosses, and most of the shutoff to the tool. The second material is a skin, grip, seal, or color cap. First shot and second shot as separate solids, or as clearly colored bodies in one file, beat a single fused lump.

Resin families for both materials

Name the substrate family and the skin family. If you have a supplier grade, add it. If you do not, the family is still enough to start review. TBD elastomer is not a family.

Bond faces and keep-off shutoffs marked on the solid

Bond in CAD is not a specification. Point to the faces. Keep-off is the inverse: faces that must stay clean. A reviewer cannot hold a face you did not name.

Supply source: molded here or customer-supplied substrate

Molded here versus supplied changes handling, incoming checks, and how the second shot is tooled. Write one of those two phrases. If the substrate will be molded here in a first tool and overmolded later, write that sequence.

Guesses get reviewed, and review can change scope. Common first-upload misses: one Boolean union with no body names; a second shot drawn as a surface coat with no land; a substrate you already molded in another shop with no incoming note.

Process Routing on the RFQ

Two-shot: both volumes molded in one cycle

If both bodies are still in CAD and neither exists as a molded part, upload both volumes. Open two-shot part design for shutoff lands and wrap edges.

Sequential overmold: substrate molded first, loaded later

If the substrate already exists as a molded part, or will be molded first and loaded later, write that the substrate is supplied or molded in a prior shot and mark the incoming faces. Open two-shot vs sequential overmold when the team has not picked a route yet.

Open to DFM: let review recommend the route

You can write open to DFM on route and still upload both volumes. Do not paste a process table into the RFQ. Name the route you want reviewed, or leave it open. If the same program also has multiple plastic SKUs, send those on quote a multi-part or family tool.

A worked routing example: the grip is new and the housing is already tooled at another source. That is a supplied-substrate sequential path. Do not upload a fused finished-shape solid and ask for two-shot. Send the incoming housing as the substrate note, plus the new skin solid, plus keep-off on faces that already carry texture or print.

What to Mark on the Solid

First-shot body and second-shot volume as separate solids

Give the skin a real thickness and a closed solid. A paint-like offset with no land is not a second-shot body. Export Body_A (substrate) and Body_B (skin) from the same coordinate system.

Shutoff land where the second material stops

That is the edge where the second material must stop. Open the two-shot design page when you need wrap-edge marks. This page does not copy that spoke.

Keep-off faces: logo pads, windows, sealing beads

Keep-off faces are the lands that must stay resin-free: logo pads, sealing beads you will gasket later, screw pockets, and any window that must stay clear. Write keep-off on those faces so flash on a logo is not a surprise.

Function of the skin: grip, seal, or cosmetic

A grip can accept a visible knit on the back side. A seal lip cannot accept a gap on the sealing land. An appearance cap cannot accept a gate vestige on the show face. Function is one word. Put it on the RFQ next to the family name.

A worked example: a device bezel gets a TPE seal in a groove and a small TPE grip on the side. Those are two second-shot volumes with two functions. Mark the groove as seal and keep-off on the sealing land. Mark the side pad as grip and allow a witness on the hidden back.

Another marking pattern that works: Body_A ABS, Body_B TPE, bond = Body_B contact faces except Face_12 logo and Face_18 USB window. Overlay a screenshot if the face IDs are hard to see, but do not send the screenshot alone.

RFQ Paste Block

Use this list on the same revision you upload. Each step is a field or a face, not a later email.

Upload a revision that shows both volumes.
Name both resin families.
Mark bond and keep-off faces.
State who supplies the substrate.
Upload through the injection molding instant quote platform.

A worked checklist block: Rev C. Body ABS, skin TPE. Substrate molded here. Bond left and right recesses. Keep-off front logo and USB window. Skin function grip. Route open to DFM. That block is enough to start. Need overmold is not.

If two skins share one family but not one function, list both functions. If two skins use different families, name both. A second family without a second volume is another incomplete package.

Common mistakes at submit:

Uploading the substrate-only file because the grip is simple.
Putting the second family in the project name only.
Attaching an old bond-test PDF with no face map.

If they already approved a single-material number, re-quote the new revision. Do not edit the old record in place and expect the same lines to hold.