Castable / wax resins (405 nm LCD/DLP)

Published · Researched 2026-09-20

Overview — what it is, best uses, key context

Castable resins are photopolymers engineered to burn out cleanly in a kiln, leaving a cavity for molten metal — the digital replacement for hand-carved jeweler's wax in lost-wax casting. Best uses: jewelry (rings, pendants, settings), dental crowns/bridges, and small metal parts in gold, silver, brass, bronze. Two sub-families: wax-based (higher wax content, smoother burnout, better for thicker pieces — e.g. Siraya Cast True Blue) and polymer-based (sharper detail, fussier burnout — e.g. Siraya Cast Purple). The resin print is only half the job: burnout schedule, investment powder, and casting method (vacuum vs centrifugal) determine success as much as the resin. This file goes deeper than resin-overview.md (which lists castable at survey level) with brand-level products, 2026 pricing, and burnout-reality notes.

Current 2026 products and brands

• Siraya Tech Cast Purple / Cast True Blue: from $34.99 sale / $42.99 list — siraya.tech direct (fresh), obs. 2026-09-20; bottle size behind "from" pricing UNVERIFIED. True Blue uses a wax-based formulation — "easier to burn out than Cast Purple", expanding range to thicker models (bracelets, large pendants, metal parts); follows common burnout schedules with standard investment powders (Siraya copy). Amazon Royal Blue 1 kg listing exists (crawl 321 days prior — stale).
• PowerResins Wax: 1 kg $280 / 500 g $160 — global.powerresins.com (fresh), obs. 2026-09-20. Claims no post-UV cure required (unusual in category — vendor claim, not independently verified). Premium pricing.
• Liqcreate Wax Castable: CAD $164.95/kg — 3dprintingcanada.com (fresh), obs. 2026-09-20.
• eSUN Castable Jewelry Green: ₱9,299 / 1 kg (MakerLab Philippines; sold out at obs.) — retailer-listed specs: tensile 42–62 MPa, elongation 11–20%, flexural 49–58 MPa, Shore D 60. Flag: the retailer page also carries generic filament safety text (suspicious copy-paste) — treat specs as reseller copy, not eSUN TDS; verification recommended.
• Formlabs Castable Wax (context, not priced here): the pro benchmark (pave-dome-ring imagery in this track's images).
• Third-party mentions (ofzenandcomputing 2026 buyer's guide, fresh): ApplyLabWork MSLA Castable, Siraya Tech Cast, Phrozen Aqua-Gray 8K named as top castable brands — no prices verified (UNVERIFIED).

Key specs (documented)

What's needed (hardware)

• 405 nm MSLA printer, 8K+ resolution strongly recommended for jewelry (ofzenandcomputing 2026: 8K = 22–28 µm XY, "sharp enough for filigree"; 14–16K for micro-prong work). Layer heights 0.03–0.05 mm.
• Kiln + burnout oven, investment powder, casting setup (vacuum or centrifugal) — the printer is the cheap part of this workflow.
• Follow the resin's burnout schedule exactly; thicker pieces need wax-based resins (True Blue class).

Brand/support reality

• Siraya Tech: best-documented hobby castable line; Purple = detail, True Blue = burnout forgiveness; active user community; ~$35–43 entry pricing is the hobby sweet spot.
• PowerResins: premium ($280/kg) with the no-post-cure claim — positioned for jewelers who value workflow speed; less community documentation (flagged).
• Liqcreate: EU professional option at ~CAD $165/kg.
• eSUN: budget entry (₱9,299/kg ≈ $160/kg class) but sold out and specs flagged.

Community verdict

The most honest community signal in this pass: a heavy Siraya Cast user (4+ bottles, desertcart review) reports prints always come out glorious; burnout is where the skill lives — Purple is 50/50 on larger pieces with vacuum casting, centrifugal casting gives more consistent results, Blue was harder to dial in for that user. Ganoksin Orchid jewelry forum (pros): burnout of castable resins is "definitely tricky"; trial-and-error with investment and schedules is expected; Elegoo/Anycubic/Prusa printers all work with third-party resins (wavelength permitting). ofzenandcomputing (Sept 2026): LCD/MSLA 8K+ is the right printer class; castable photopolymers (not PLA/ABS) are the only sane pattern material. Consensus: budget more learning time for burnout than for printing.

Pricing — observed 2026-09-20 (per kg/L as listed)

Sources consulted

• Google web search 2026-09-20: global.powerresins.com Wax product page; 3dprintingcanada.com Liqcreate Wax Castable; makerlab.ph eSUN Castable Jewelry Green; siraya.tech Cast product page + two blog guides (913/1070-day-old pages, 2-day crawls); ofzenandcomputing.com Sept 2026 jewelry-casting buyer's guide; desertcart.in Siraya Tech Cast review thread (user burnout reports); orchid.ganoksin.com jewelry forum thread; Amazon Siraya Cast Royal Blue (stale 321-day crawl); indiamart Siraya Cast True Blue listing.
• Facebook groups: zero relevant posts (2026-09-20 pass).
• Reddit: no castable-specific Reddit thread verified this pass (the browser query surfaced guides/forums instead — recorded as gap).

Image notes

• ../../images/castable-resins-01.jpg — pave dome ring printed in castable wax resin (formlabs.com).
• ../../images/castable-resins-02.jpg — Formlabs castable wax resin jewelry print examples (Systematics dealer page; replacement — original 3dprinting.com URL returned 403; substitution documented in manifest).
• ../../images/castable-resins-03.jpg — castable wax resin rings on build platform (formlabs.com). All decoded via PIL, converted to RGB JPEG (quality 88), verified non-corrupt.

Open questions / UNVERIFIED

• Siraya Tech Cast bottle sizes behind "from" pricing — UNVERIFIED.
• PowerResins "no post-UV cure" claim — vendor claim, independent verification UNVERIFIED.
• eSUN Castable Jewelry Green specs — reseller copy with suspicious generic text; treat as UNVERIFIED until eSUN TDS checked.
• ApplyLabWork MSLA Castable and Phrozen Aqua-Gray 8K pricing — UNVERIFIED.
• Quantitative ash-residue comparisons between wax-based and polymer-based resins — UNVERIFIED.

Deepening pass (2026-09-20)

Social pulse (Facebook first)

• Failed source, substituted: keyword queries for castable/castable-resin returned zero posts in both the Engineering Filament Lab group and the 17k-member "3D Printing" general group (2026-09-20). Castable resins live outside Facebook — the working conversation is in jeweler/pro spaces (Ganoksin Orchid, Formlabs forums, Siraya user groups) and professional jewelry workflow writing. This is recorded as a substitution, not as social evidence.
• Substitute professional signal: a jeweler's workflow writeup (LinkedIn, 2026) makes the cleanest statement of the category's reality: successful printing does not guarantee successful casting. The list of variables that decide the outcome — trapped uncured resin or wash alcohol inside hollowed patterns, pattern thickness, weak investment, aggressive burnout, poor gas escape, ash residue, support scars, distortion — reads like a failure-modes checklist, and matches what the forums say independently.

Forums / communities

• Formlabs community forum (purple castable resin thread): owners warn that thick sections can crack or erode the investment during burnout; hollowing a pattern can trap uncured resin or wash alcohol that then has nowhere to go; and support-contact regions cure differently than the rest of the print, which shows up as burnout and surface-finish differences on the finished metal. Practical read: hollowed patterns need drainage and thickness discipline, not just thinner walls.
• Formlabs casting-issues thread: one owner reported a six-hour burnout schedule was inadequate for clean results — the fix direction was a longer, resin-specific ramp with a higher peak temperature. Generic wax schedules are a starting point, not a guarantee.
• 3D Printing Industry (jewelry casting coverage): there is no universal burnout schedule. The same piece notes both failure directions: an aggressive burnout can crack the investment, while insufficient heat leaves ash/resin residue that damages metal flow and surface finish. The resin matters, but the schedule matters as much.

Failure modes and fixes (new this pass)

• Cracked investment from thick sections / aggressive schedules: pair wax-based resins with thick pieces; keep ramps resin-specific and conservative before pushing peak temperature.
• Trapped resin or IPA in hollowed patterns: drain hollow patterns and confirm full solvent evaporation; a pattern that still smells of wash alcohol is not ready for investment.
• Support scars showing up in metal: support contact points cure differently — plan supports on faces that will be cleaned up post-cast, or expect finish differences.
• Ash/residue blocking metal flow: insufficient heat leaves residue that ruins flow and finish; if castings come out pitted, heat profile — not the resin — is the first suspect.
• One purchaser account of Siraya's Cast resin (search result, 2026-09-20): repeated washing, curing in glycerin or oil rather than air, a very long post-cure, and a careful high-temperature burnout — and still finicky after nearly a full kilogram. Attribute this as a single-user anecdote, not a universal verdict; it rhymes with the forum evidence but remains one data point.

Brand comparisons (new)

• Siraya Cast Purple vs True Blue: the file's existing distinction holds up in this pass — Purple for fine detail with fussier, thickness-sensitive burnout; True Blue wax-based for thicker pieces on standard wax schedules. The new evidence adds the caveat that "standard wax schedule" still means schedule discipline.
• Formlabs Castable Wax: remains the pro benchmark in this track's imagery and in jeweler coverage, but no 2026 price was verified in this pass (UNVERIFIED — do not quote a price).
• PowerResins Wax: premium pricing ($280/kg, see below) with the unusual no-post-UV-cure vendor claim; still no independent verification of that claim in this pass.

Price verification (2026-09-20, dated)

• Siraya Tech Cast (Purple/True Blue): from $34.99 sale / $42.99 list, siraya.tech direct (fresh); bottle size behind "from" pricing still UNVERIFIED.
• PowerResins Wax: $280 / 1 kg, $160 / 500 g (= $320/kg equivalent), global.powerresins.com (fresh).
• Liqcreate Wax Castable: CAD $164.95/kg, 3dprintingcanada.com (fresh).
• eSUN Castable Jewelry Green: ₱9,299/kg, makerlab.ph — sold out at observation; specs remain flagged reseller copy.
• Formlabs Castable Wax: no current price verified this pass (UNVERIFIED).

Deepening pass 3 (2026-09-21)

New evidence (public search, observed 2026-09-21):

• 2026 owner reviews (shopabunda.com listing, reviews crawled 2026-09-21): July 1, 2026 review — Purple gave crisp prints but recurring ash/porosity; True Blue was harder to print accurately; a measured 50/50 Purple/True Blue blend produced a successful casting. Heavy user: Purple was more consistent under centrifugal casting than vacuum casting; printing itself was reliable, burnout/casting remained the problem. Reinforces "casting process, not the resin, is the bottleneck."
• Siraya vendor-hosted practitioner workflow (siraya.tech blog): 50/50 Purple/True Blue blend — Purple for print forgiveness/detail, True Blue for burnout; instructions include complete blow-drying after washing, and if a cured pattern shows moisture/sweating it should be discarded rather than rescued. Attribute as vendor-hosted workflow, not independent proof.
• Facebook: keyword-less browse of the 7k-member "Dental Resins & Dental 3D Printing" group showed one practitioner asking about investment material after printing castable resin (no replies); no usable castable-resin comparison data.

Pricing dated 2026-09-21: Siraya Cast "from" ~$30/1 kg observed on Amazon (search snippet — freshness flagged); WoodArtSupply True Blue 500 g $38.63 sale / $45.99 regular (listing crawled 161 days earlier — dated). No fresh 2026 BlueCast or printer-specific price changes found.

Persistent gaps: no independent controlled blend-ratio study; investment burnout schedules from non-vendor sources; no Facebook-group owner data.