POM / acetal (Delrin)

Published · Researched 2026-09-20

Overview — what it is, best uses, key context

POM (polyoxymethylene), sold as acetal or DuPont's Delrin brand, is the engineering plastic of precision moving parts: exceptionally low friction, high wear resistance, high stiffness, and excellent dimensional stability — the material of machined gears, bearings, bushings, and sliding components. In FDM it is a notorious specialist filament: it prints low-friction parts nothing else in this track can match, but bed adhesion is legendarily bad (POM barely sticks to any build surface) and it demands a hot bed with careful first-layer work. Best uses: gears, bearings, pulleys, linear bushings, wear pads, and sliding mechanisms — anywhere you'd otherwise machine Delrin. Notable: Grilon3 (Argentina) is one of the few brands actively marketing POM filament with 3D-printing guidance.

Current 2026 products and brands

• Gizmo Dorks POM (1.75 mm and 2.85 mm, black): 1 kg $26.95 (Amazon one-time; $25.60 sale) — stale crawl (224 days prior), obs. 2026-09-20; current street price UNVERIFIED. Desertcart Israel listing: ₪215 incl. duties/fees. Retailer-listed print specs: nozzle 210–230 °C, bed 100–110 °C, ±0.02 mm tolerance.
• Grilon3 Acetal (Argentina, white/black 1 kg): exists with active 3D-printing guidance (grilon3.com.ar; image-verified) — price UNVERIFIED in this pass.
• Generic POM filament (Amazon/desertcart marketplace listings, 1.75/3 mm): ~$27/kg class — brand and quality UNVERIFIED.

Key specs (documented, retailer listings)

What's needed (hardware)

• Bed adhesion strategy is everything: high bed temps (100–110 °C), and community practice centers on specialty surfaces/adhesives — standard glue stick/PEI is often insufficient (exact best-practice surface UNVERIFIED in this pass — coverage gap, flagged).
• Enclosure recommended: warping is significant, and POM can release formaldehyde when overheated/degraded — ventilation or filtered enclosure is a safety requirement, not a suggestion (general polymer-safety knowledge; specific emission data for filament printing UNVERIFIED in this pass).
• All-metal hotend comfortable at 230 °C+; avoid excessive temps (degradation risk).
• Dry storage; POM is low-uptake but surface moisture still defects prints.

Brand/support reality

• Gizmo Dorks: the only widely listed US POM filament brand; budget pricing (~$27/kg class) but stale availability data — verify live before ordering.
• Grilon3: regional (Argentina/LatAm) specialist with the best public POM-printing guidance found; limited global distribution.
• POM filament is a micro-niche: 2–3 active brands found in this survey; expect limited stock and thin documentation.

Community verdict

Thin in this pass (FB zero-yield; no POM-specific thread pulled — coverage gap, recorded). The material's reputation is consistent wherever it surfaces: unmatched for printed gears and sliding parts, punishing to get sticking to the bed. It is a "second printer material" — not a first foray into engineering filaments. Formaldehyde/degradation-fume caution is the standard safety footnote in POM printing guides.

Pricing — observed 2026-09-20 (per kg)

Sources consulted

• Google web search 2026-09-20: Amazon Gizmo Dorks POM listing (224-day crawl — stale); desertcart.co.il Gizmo Dorks POM (specs: 210–230 °C / 100–110 °C); wiki.opensourceecology.org POM page (background); grilon3.com.ar acetal pages (image + guidance); meeraqe.com POM filament page (image).
• Facebook groups: zero relevant posts (2026-09-20 pass).
• Reddit/forums/YouTube: no POM-specific thread pulled this pass (coverage gap, recorded).

Image notes

• ../../images/pom-acetal-01.jpg — Grilon3 acetal POM filament 1 kg white spool (mebac.com.ar).
• ../../images/pom-acetal-02.jpg — Grilon3 white acetal POM filament (grilon3.com.ar).
• ../../images/pom-acetal-03.jpg — generic POM polyformaldehyde filament spool (Amazon media via desertcart). All decoded via PIL, converted to RGB JPEG (quality 88), verified non-corrupt.

Open questions / UNVERIFIED

• Gizmo Dorks current street price and availability (224-day-old data) — UNVERIFIED.
• Grilon3 Acetal pricing — UNVERIFIED.
• Mechanical/friction TDS figures for any filament POM — UNVERIFIED in this pass.
• Best-practice bed surface/adhesive for POM (community consensus) — UNVERIFIED in this pass.
• Formaldehyde emission data specific to FDM printing of POM — UNVERIFIED (general caution only).
• Whether any 2026 POM filament carries food-contact or other certifications — UNVERIFIED.

Deepening pass (2026-09-20)

Social layer: Facebook groups zero-yield (8 keyword queries across "3D Printing" 17k and "3D Printing World" 10k — polypropylene, POM, sintering, PVA, BVOH, PEEK, ABS-like resin, silk PLA — none returned relevant posts). Threads keyword search returned zero results for every query (effectively unusable; prior pass reported it erroring too). Instagram has no public topic search via the CLI (account-scoped only) — no IG signal, noted honestly. Usable signal came from the Bambu Lab and Prusa forums plus retailer copy.

The bed-adhesion answer (Bambu Lab forum, April 2025 — best POM practitioner thread found): one experienced poster who has printed POM parts up to 150 mm diameter states POM sticks to essentially one bed type: G10/Garolite/Printbite — i.e. epoxy/fiberglass board — because bisphenol epoxies and acetals can bond chemically, the same trick used for PC. His verified recipe: clean G10 with acetone, scuff evenly with fine abrasive (rougher side of a foam manicure stick), wipe clean again; bed 110 °C, nozzle 260 °C first layer / 250–255 °C others; dry the filament hard (cheap food dehydrator at 70 °C); max volumetric ~7 mm³/s but otherwise run a generic PA/PC profile. His verdict once dialed in: "the strongest, toughest, best layer adhesion material you can print with" — the strongest pro-POM statement found anywhere in this project. Caveats from the same thread: POM shrinks "about the same as raw PA, which is a lot"; at print temps formaldehyde release is minimal but ventilation is still required; never burn it.

Competing adhesion lore (retailer copy vs practitioners): WoodArtSupply's Gizmo Dorks listing gives the retailer view — 210–220 °C extrusion, never keep POM above 230 °C (formaldehyde), bed 110 °C, 30 mm/s, and the claim that POM "prefers wood or cellulose based platforms" (resume paper glued to glass with Elmer's; blue painter's tape + hairspray gives mixed results depending on brand). The reprap forum archives add a darker data point: Delrin tape works but is one-shot — it becomes your "zeroth layer," and larger parts peel the tape off the bed entirely; objects were limited to ~20 mm cubes in that practitioner's tests. So the adhesion story has three tiers: G10/Garolite (best, practitioner-verified to 150 mm), cellulose/paper platforms (workable, small parts), painter's tape (mixed).

PCTG as the escape hatch (Prusa forum, 2024): when a practitioner asked for a low-friction POM alternative that's actually printable, the recommendation was PCTG — easy to print, excellent layer adhesion, outdoor-suitable, fairly tough with low abrasion and low friction. That's the material to reach for when you need "slippery-ish" without the POM ordeal. POM+GF/CF filled grades exist but worsen the already-fragile layer adhesion.

Price re-verification (2026-09-20): Gizmo Dorks POM is still $26.95/kg on Amazon (1.75 mm white, ASIN B00LAJNE6C; $25.60 with Subscribe & Save) — the 224-day-old crawl from the first pass has held. PriceAnalyser history shows the same SKU at $49.99 back in 2017 — POM filament has roughly halved in a decade. Desertcart Israel lists black 1 kg at ₪215 incl. duties (7-day crawl, in stock). Grilon3 pricing remains UNVERIFIED.

Brand vs brand: no direct shootout exists — with only 2–3 active brands, there isn't enough market for one. Gizmo Dorks remains the default US buy on price and availability; Grilon3 (Argentina) remains the best-practice-documentation brand. Neither has serious competition to be compared against.

Deepening pass 3 (2026-09-21)

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

• RepRap thread: Delrin tape as a "zeroth layer" works only around 20 mm scale; larger parts peel the tape off the bed. Adds a scale limit to the Delrin-tape anecdote.
• MakerForums practitioner: wood glue on a 120 °C glass bed worked, printing around 205 °C. One more adhesive datapoint.
• Prusa forum "POM Filament Printing": hot enclosure recommended; glass/carbon-filled grades can reduce warp but worsen already-poor layer adhesion; several owners concluded PCTG or machining was the rational alternative. Reinforces the pass-2 "buy a POM rod" theme.
• Conflict to carry forward: the 250–260 °C on G10 practitioner recipe versus the "never exceed 230 °C" retailer guidance are contradictory sources, not one universal rule — kept as flagged. Specific FDM formaldehyde-emission data remains UNVERIFIED.

Pricing dated 2026-09-21: no current per-brand prices found; previous prices stand.

Persistent gaps: no 2026 POM-specific vendor TDS update; no Facebook-group owner data; the two small POM communities remain too quiet for reliable sampling.