Yes—but only for prototypes, bridge tooling, and short runs. A high-temperature resin mold insert can produce real injection-molded thermoplastic parts, but it is not a general replacement for aluminum or steel tooling. In one reported demonstration, a Formlabs Form 3+ printed a mold from Rigid 10K resin for an APSX-PIM machine, which molded polypropylene in approximately 65 seconds per cycle and reportedly reached 500 automatic cycles. That result applies to one specific part and process—not to every printed mold.
The “ejector pins and all” claim also needs qualification: the evidence confirms an automatic ejection system, but does not clearly prove that the pins themselves were 3D-printed.
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What was actually demonstrated?
The setup reported by Hackaday consisted of:
- Printer: Formlabs Form 3+ stereolithography printer
- Mold material: Formlabs Rigid 10K resin
- Injection press: APSX-PIM
- Injected material: polypropylene
- Reported cycle time: approximately 65 seconds
- Reported service life: 500 automatic cycles
The small round molded part was described as appearing similar to a lid or gear. The mold included an ejection mechanism so the part could be removed automatically after the mold opened.
That is a useful proof of concept, not a standardized durability test. The report does not establish a universal life for Rigid 10K molds, and important variables—including insert dimensions, print orientation, post-curing, gate design, venting, cooling, and failure criteria—affect the result.
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APSX’s own guidance gives substantially lower example lives for several materials: roughly 50 to 100 cycles. The two figures are best understood as condition-specific. A simple, small polypropylene part may survive far more cycles than a large, highly stressed part made with a hotter or more demanding material.
What is actually printed?
A printed injection mold is normally a system, not just a plastic block. It may contain:
- A printed cavity insert
- A printed core insert
- A sprue, runner, and gate
- Vents for trapped air
- Alignment features
- An aluminum mold holder or mold base
- Bushings and ejector hardware
APSX’s 3D-printed insert mold holder is described as a 6061 aluminum holder supplied with bushings and pins installed; the user prints the mold insert. APSX also sells conventional metal ejector-pin systems.
So there are several different meanings of “3D-printed ejector pins”:
- A printed cavity and core used with standard metal ejector pins.
- A printed holder containing metal bushings and pins.
- Custom printed ejector features or sacrificial ejectors.
- A mold in which the pins themselves are printed.
The supplied evidence supports the first or second type of arrangement, but does not clearly establish that the ejector pins in the demonstration were printed. The safe conclusion is that a printed mold can be combined with automatic ejection.
Why print a mold instead of the finished part?
Direct 3D printing is usually the better choice when only a few parts are needed or the design is changing rapidly. A printed mold becomes attractive when the part must be made from a production thermoplastic and several identical parts are required.
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Injection molding can provide:
- Parts made from materials such as polypropylene, polyethylene, ABS, nylon, polycarbonate, or acetal rather than only the materials available for direct printing.
- Faster repetition once the process is set up.
- More consistent geometry across a batch.
- A practical way to evaluate flow, weld lines, shrinkage, sink marks, warping, and ejection before ordering production tooling.
APSX positions printed molds for rapid prototyping and limited production, not mass manufacturing. A mold that lasts 50, 100, or even 500 shots is useful for design verification and small batches, but it is not comparable with a production steel mold designed for thousands or millions of cycles.
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- The mold closes around the cavity.
- Molten plastic is injected through the sprue, runner, and gate.
- The part cools enough to retain its shape.
- The mold opens along the parting line.
- Ejector pins push the part away from the core.
Ejection is not always necessary for a single trial shot. APSX says its machine can run a mold without ejector pins in single-cycle mode, allowing the operator to remove the part manually. An ejector system becomes more valuable for automatic multi-cycle operation.
Ejector pins must be properly guided and aligned. Excessive force, a pin positioned over a weak section, shrinkage around the core, or a softened resin insert can break the pin or damage the mold.
Why the printed mold needs support
The printed insert is generally not expected to absorb all clamp and injection loads by itself. An aluminum holder or mold base supports it, keeps the mold halves aligned, and transfers force through a stronger structure.
Printed molds are most promising for small parts with relatively simple geometry. Large parts require more injection pressure, more clamp force, and more material around the cavity. Thin mold sections, sharp internal corners, and abrupt transitions become stress concentrators that can crack during injection or ejection.
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Cooling is equally important. Repeated exposure to hot polymer and thermal cycling can soften, crack, or embrittle photopolymer resin. APSX says that air cooling through its holder can help increase mold life and warns that the mold needs sufficient cooling time between cycles.
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What makes a resin suitable?
A suitable mold resin needs more than a high nominal temperature rating. It should have:
- High heat resistance at the selected melt temperature
- Stiffness and compressive strength under clamp and injection loads
- Low creep during repeated cycles
- Dimensional stability after washing and post-curing
- Resistance to cracking during thermal cycling
- A sufficiently smooth and accurate surface
- Compatibility with the injected polymer and any release agent
APSX presents Formlabs Rigid 10K as a suitable high-performance resin for limited runs and also discusses engineering materials such as Tough 2000. Ordinary PLA, PETG, or standard hobby resin should not be assumed suitable. Their performance depends on melt temperature, pressure, geometry, reinforcement, post-processing, and cycle conditions.
Release agents require particular caution. APSX warns that agents used with sticky materials such as TPU and polycarbonate can damage the mold. Check compatibility with both the printed resin and the injected polymer before applying anything to the cavity.
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Materials and indicative mold life
APSX lists the APSX-PIM process as compatible with materials including polypropylene, polyethylene, thermoplastic olefin, nylon, polycarbonate, acetal/Delrin, ABS, and PC/ABS, provided the material meets the machine’s flow requirements. Its published example figures are:
| Material | Example melt temperature | Example pressure | Example cycle | Listed mold life |
|---|---|---|---|---|
| PP | 220 °C | 100 bar | 150 s | 100 cycles |
| HDPE | 225 °C | 150 bar | 120 s | 100 cycles |
| ABS | 220 °C | 95 bar | 160 s | 60 cycles |
| PC/ABS | 240 °C | 95 bar | 160 s | 60 cycles |
| Delrin/POM | 180 °C | 150 bar | 120 s | 60 cycles |
| Nylon | 260 °C | 80 bar | 120 s | 50 cycles |
These are manufacturer guidance figures, not universal limits. Nylon and other hygroscopic plastics may need careful drying before molding. Higher temperatures, difficult flow paths, high packing pressure, and inadequate cooling can shorten mold life.
Design rules for a printable injection mold
Use generous draft
Draft helps the part release from the core without scraping or pulling on the insert. APSX’s printed-mold guidance recommends approximately 2° to 5° for these molds, while its broader injection-mold information cites approximately 1° to 3° as a general guideline. Printed tooling benefits from the larger range when the part’s appearance and dimensions allow it.
Keep walls reasonably uniform
Uneven wall thickness promotes sink marks, warping, and uneven cooling. Use ribs and other reinforcing features carefully rather than creating large thick sections.
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Choose the parting line deliberately
Place the parting line where flash can be tolerated and where both halves can separate cleanly. Avoid trapping the part on the wrong side of the mold.
Plan the gate and runner
Gate position affects filling pressure, weld lines, cosmetic quality, packing, and shrinkage. A narrow or poorly placed gate can freeze early and produce short shots.
Vent the cavity
Air must escape as plastic enters. Poor venting can cause short shots, burn marks, trapped bubbles, or incomplete filling. Vents should be placed where air is likely to be trapped, while avoiding unnecessary weakening of the insert.
Avoid difficult undercuts
Unless the design includes side actions, flexible features, a collapsible core, or another release strategy, undercuts can lock the part into the mold. Simpler geometry is a major advantage for printed tooling.
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Fillets reduce stress concentrations in the part and the tool. Leave enough resin around the cavity to resist cracking, particularly behind thin walls, at corners, and near the gate.
Account for surface finish
Printed texture can transfer directly to the molded part. Orientation, layer resolution, sanding, polishing, and deliberate texturing all affect the final surface. A smooth-looking CAD model does not guarantee a smooth molded surface.
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For an APSX machine, confirm the mold interface before printing. APSX provides mold drawings and STEP files for its interface.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A practical CAD-to-first-shot workflow
- Design the part: Add draft, uniform walls, radii, and a deliberate parting line.
- Design the tool: Include the core, cavity, sprue, runner, gate, vents, alignment features, and ejection system.
- Check compatibility: Verify insert dimensions, holder fit, clearances, and press requirements.
- Print: Use a suitable engineering resin and an appropriate high-resolution process.
- Wash and post-cure: Follow the resin manufacturer’s specified procedure; incomplete post-curing can affect strength and dimensions.
- Inspect: Check mating faces, cavity dimensions, vents, gate, alignment, and ejector clearances.
- Install: Fit the inserts into the aluminum holder or mold base.
- Start conservatively: Use a material and settings recommended for the press, beginning with low-risk process conditions.
- Make a first shot: Look for short fill, flash, sticking, warpage, and damage.
- Tune the process: Adjust melt temperature, injection volume, pressure, cooling time, and ejection.
- Track the tool: Log shot count and inspect the mold regularly rather than waiting for a catastrophic failure.
- Retire it early: Stop when cracks, deformation, severe wear, sticking, or dimensional drift appears.
The APSX-PIM manual includes installation information for molds with ejector pins. Machine-specific instructions take priority over generic process advice.
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| Symptom | Likely causes | First correction |
|---|---|---|
| Short shot | Low temperature, poor venting, insufficient shot volume, unsuitable flow | Check material preparation, temperature, gate, venting, and shot volume |
| Flash | Excessive pressure, damaged parting surface, poor alignment, insufficient clamp | Reduce process stress and inspect the parting line and alignment |
| Part sticks | Insufficient draft, rough cavity, undercut, excessive packing | Add draft or redesign the release surface; reduce ejection load |
| Mold cracks | Thin sections, sharp corners, high pressure, inadequate backing | Add material and radii, then reduce process stress |
| Ejector breaks | Misalignment, excessive force, softened resin | Improve guidance and alignment; reduce ejection force and heat exposure |
| Warped part | Uneven cooling or wall thickness | Increase cooling and revise the part geometry |
Does the economics make sense?
Compare the complete workflow, not just the cost of resin. APSX listed the APSX-PIM V3 at $13,500, its 3D-printed insert holder at $500, an optional enclosure at $2,000, and a part picker at $2,750. Its plastic starter kit was listed at $250. An APSX ASTM test mold was listed at $500, with an ejector-pin option of +$1,250 and polishing of +$350 when those pages were checked in August 2026. Prices can change.
Those figures exclude the printer, resin, wash and cure equipment, electricity, failed prints, redesigns, safety equipment, maintenance, and labor. A $13,500 press is difficult to justify for a handful of prototype parts. Outsourcing molded parts or using direct 3D printing may be cheaper.
Printed tooling becomes more compelling when the team already owns or can access a suitable SLA/DLP printer and needs dozens to a few hundred parts in a real injection-molding material. For thousands of parts, aluminum tooling usually provides better durability, cooling, cycle time, consistency, and unit economics. Steel is the appropriate direction for high-volume production, tight tolerances, complex slides, hot runners, or millions of cycles.
Safety is part of the process
This workflow combines hot polymer, pressurized injection, pinch and crush points, possible mold rupture, resin-handling chemicals, and potentially hazardous fumes or decomposition products. Use the machine’s guarding, operating instructions, eye protection, ventilation, and site-specific safety procedures. Do not treat a desktop injection press and a resin mold as a casual household experiment.
When should you use a 3D-printed mold?
- Excellent fit: prototypes, bridge tooling, small batches, and designs that are still being refined.
- Conditional fit: low-volume production of small, simple parts with moderate tolerances.
- Poor fit: large parts, thin-wall geometries, demanding tolerances, aggressive materials, unattended production, or long service life.
Use direct 3D printing when only a few parts are required or the design is changing too quickly to justify a mold. Choose machined aluminum when the design is stable and the run is larger than a printed insert can reliably support. Choose steel for sustained, high-volume production.
Quick Recap
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