FDM Part VII Polycarbonates

FDM Polymers — A Technical Reference ›

Part VII — Polycarbonates

Poly­car­bon­ate (PC) is the highest-T_g amor­phous poly­mer rou­tine­ly ac­ces­si­ble at the con­sumer FDM tier — and the poly­mer most like­ly to be sold under a name that doesn't de­scribe what's in the spool.

Al­most every "PC" fil­a­ment is an alloy or com­pos­ite, not pure poly­car­bon­ate; the en­gi­neer­ing en­ve­lope

and the pro­cess­ing win­dow both de­pend on which.

15. PC and PC blends — deep dive

Poly­car­bon­ate (PC) oc­cu­pies a spe­cif­ic niche in the FDM poly­mer hi­er­ar­chy: amor­phous, trans­par­ent in its pure form, with T_g ~145–150 °C, HDT around 135–145 °C at 0.45 MPa, ten­sile yield 60–70 MPa, and high notched-impact resistance on the correct test basis. Neat PC resin can reach roughly 60–85 kJ/m² notched Izod in ductile failure, but many PCTG grades also publish no-break or very high resin-basis impact results; compare impact only when method, specimen type, print orientation, and dry/conditioned state match. PC blends sit lower than neat PC but remain high-toughness FDM engineering materials. It is the en­gi­neer­ing work­horse for parts that load at 100–130 °C in ser­vice — au­to­mo­tive under-hood brack­ets, elec­tron­ics en­clo­sures, op­ti­cal mounts, struc­tural com­po­nents. The catch is that pure un­mod­i­fied PC is rare in com­mer­cial FDM fil­a­ment. The mar­ket di­vides into PC al­loys (blend­ed with an­oth­er poly­mer at the resin level to re­duce warp and shift me­chan­i­cal bal­ance) and PC com­pos­ites (com­pound­ed with fibers, con­duc­tive ad­di­tives, flame-re­tar­dant pack­ages, or PTFE). Choos­ing be­tween them is the entry-level skill for using "PC" in FDM; print­ing them well is the next-level skill.

15.1 Polycarbonate chemistry

BPA-poly­car­bon­ate (bisphe­nol-A poly­car­bon­ate) is the dom­i­nant chem­istry — a ther­mo­plas­tic polyester of car­bon­ic acid con­densed with the bisphe­nol-A diol. The bulky aro­mat­ic groups and the car­bon­ate link­age pro­duce a poly­mer that is amor­phous (no crys­tallini­ty, full trans­paren­cy in clear grades, no Schlieren tex­ture), glass-like in me­chan­i­cal char­ac­ter (high stiff­ness com­bined with sub­stan­tial im­pact tough­ness), high-T_g, and pro­cess­able from 280–320 °C in in­jec­tion mold­ing. Major West­ern brand­ed resins un­der­lie much of the com­mer­cial PC fil­a­ment mar­ket: Cove­stro Makrolon, SABIC Lexan, Mit­subishi Iupi­lon, and Trin­seo Cal­i­bre — with Teijin, LG Chem, Lotte, and Wanhua now also among the largest global PC producers. Fil­a­ment TDS rarely iden­ti­fy the base resin; dif­fer­ences in molec­u­lar weight, ad­di­tive pack­ages, and (for al­loys) the part­ner poly­mer ac­count for most brand-to-brand vari­ance in print­ed per­for­mance.

BPA it­self is a reg­u­lat­ed monomer with doc­u­ment­ed en­docrine-dis­rup­tion con­cerns at con­sumer-ex­po­sure lev­els. In fin­ished poly­mer form only trace un­re­act­ed monomer re­mains, which is the rel­e­vant con­text for print­ed-part safe­ty — ef­fec­tive­ly neg­li­gi­ble for print­ed sur­faces, but worth flag­ging for risk-com­mu­ni­ca­tion pur­pos­es when end users ask. For ap­pli­ca­tions where BPA is a reg­u­la­to­ry or per­cep­tu­al con­cern, East­man Tri­tan (a TMCD-rich ter­poly­mer mar­ket­ed as a poly­car­bon­ate sub­sti­tute, cov­ered in Chap­ter 8) offers hydrolytic stability superior to PC (which hydrolyzes in hot water) at the cost of a substantially lower HDT (~95–110 vs ~135–145 °C), with­out using BPA. Tri­tan-class resin car­ries food-con­tact cer­ti­fi­ca­tion at the resin level — but, as §8.9 stress­es, that cer­ti­fi­ca­tion does not trans­fer to a print­ed part: FDM layer lines har­bor con­tam­i­na­tion and ho­tend residue, so any food- or med­i­cal-con­tact use re­quires seal­ing and its own qual­i­fi­ca­tion re­gard­less of the resin's pedi­gree.

15.2 The PC labeling problem (deepening §2.4)

Part I §2.4 in­tro­duced the prin­ci­ple: "PC" on a fil­a­ment label is al­most al­ways an alloy or com­pos­ite. The de­tail mat­ters for pro­cure­ment and process plan­ning.

PC al­loys blend PC with an­oth­er poly­mer at the resin level. The part­ner poly­mer rais­es one prop­er­ty at the ex­pense of an­oth­er. PC/ABS is the dom­i­nant alloy: ABS lowers T_g and HDT, lowers room-temperature notched im­pact relative to neat PC while improving low-temperature im­pact and reducing notch sensitivity (the bu­ta­di­ene phase ab­sorbs en­er­gy), re­duces warp dur­ing cool­ing, improves processability, and low­ers cost. The trade is well-bal­anced for gen­er­al-pur­pose en­gi­neer­ing work. PC/PBT is the sec­ond-most-com­mon alloy: PBT is a semi-crys­talline polyester; the alloy re­tains PC's stiff­ness and high T_g while adding chem­i­cal re­sis­tance and crys­tallini­ty-driv­en im­pact re­ten­tion. The alloy car­ries a T_m value on its TDS (typ­i­cal­ly 220–230 °C from the PBT phase) where pure PC does not. PC/ASA com­bines PC's heat re­sis­tance with ASA's UV sta­bil­i­ty; rel­e­vant for out­door parts but rare in com­mer­cial fil­a­ment. PC/PCTG re­tains PC trans­paren­cy and stiff­ness while adding PCTG's tough­ness; rare, and rarely an­nounced.

PC com­pos­ites com­pound PC with a filler or ad­di­tive. PC-CF and PC-GF add stiff­ness and HDT at the cost of brit­tle­ness and abra­sion. ESD-PC with con­duc­tive ad­di­tives (car­bon nan­otubes or spe­cial­ty car­bon black) drops sur­face re­sis­tiv­i­ty into the elec­tro­stat­ic-dis­si­pa­tion range. FR-PC with flame-re­tar­dant pack­ages tar­gets UL94 V-0 com­pli­ance. PC/PTFE with PTFE com­pound­ed in pro­vides low-fric­tion sur­faces for wear ap­pli­ca­tions.

Fil­a­ment TDSs typ­i­cal­ly dis­close "PC blend" (alloy with part­ner un­named) or "PC + N% [filler]" (com­pos­ite with the load­ing spec­i­fied). The me­chan­i­cal en­ve­lope, pro­cess­ing win­dow, and print­abil­i­ty all de­pend on which ap­proach was used. Prusa­ment PC Blend, Bambu PC, and Poly­Max PC — the three most well-doc­u­ment­ed gen­er­al-pur­pose PC prod­ucts on the con­sumer mar­ket — are all al­loys with undis­closed part­ner poly­mers; Poly­mak­er's PC-ABS and PC-PBT, by con­trast, name their alloy part­ners ex­plic­it­ly.

15.3 General-purpose PC blends

This is the con­sumer de­fault for "I need PC be­hav­ior on pro­sumer hard­ware." Me­chan­i­cal en­ve­lope: ten­sile yield 55–65 MPa (lower than pure PC's 65–70), T_g 105–150 °C de­pend­ing on the alloy part­ner, HDT @ 0.45 MPa 95–145 °C. Print at 260–290 °C noz­zle, 100–115 °C bed, en­closed cham­ber strong­ly rec­om­mend­ed (pas­sive 40–50 °C ad­e­quate for most parts up to ~150 mm; ac­tive cham­ber pre­ferred above that). Brass noz­zles wear ac­cept­ably on un­filled PC blends. The cat­e­go­ry in­cludes:

Product	Class	Tg(°C)	HDT @ 0.45 MPa (°C)	Tensile yield (MPa)	Notes
Prusament PC Blend	PC alloy (partner not disclosed)	—	113	63	Most widely-documented consumer PC; published printed-specimen data
Bambu PC	PC (alloy-tuned for lower shrinkage)	145	112	55	Active chamber 45–60 °C specified; glue plate; dry before printing
PolyMax PC	Engineered PC alloy (partner not disclosed)	113	—	60	Anneal recommended at 100 °C for 2 h to lock in HDT
Polymaker PC-ABS	PC/ABS alloy (explicit)	109	—	40	Vicat 135 °C; entry-level toughness; lowest cost in family
Polymaker PC-PBT	PC/PBT alloy (explicit)	140	—	42	Crystallizing alloy; Tm 223 °C on TDS; chemical resistance step-up
AzureFilm PC-ABS	PC/ABS alloy	—	120	—	Automotive-positioning; budget tier

_{Table 15.1 — Gen­er­al-pur­pose con­sumer PC blends. The Tg spread from 109 °C (Poly­mak­er PC-ABS) to 145 °C (Bambu PC) re­flects the alloy-part­ner choice di­rect­ly: more ABS low­ers Tg, more PC rais­es it. Pro­cure­ment note: ten­sile val­ues from Poly­mak­er prod­ucts are XY print­ed-coupon yield, while Prusa­ment and Bambu val­ues are XY ten­sile strength — not di­rect­ly com­pa­ra­ble as writ­ten. Al­ways cross-check the TDS test method be­fore rank­ing prod­ucts on ten­sile.}

#### 15.4 PC-CF and PC-GF composites

Fiber-re­in­forced PC rais­es stiff­ness, HDT, and di­men­sion­al sta­bil­i­ty — and low­ers warp ten­den­cy on long flat parts where un­filled PC's ther­mal-con­trac­tion stress dom­i­nates — at the cost of brit­tle­ness, abra­sion, and sub­stan­tial­ly com­pro­mised Z-strength. Load­ing is typ­i­cal­ly 10–30 wt%.

Product	Filler	HDT @ 0.45 MPa (°C)	Tensile yield (MPa)	Notes
Prusament PC Blend CF	~10–15% CF (loading not disclosed)	114	64	Hardened nozzle advised; matches Prusament PC Blend on Tg with stiffness gain
Spectrum PC CF	10% CF	140	76	Vicat 150 °C; dry box yes; hardened nozzle
Ultrafuse PC GF30	30% glass fiber	140	36	Tg 142 °C; very stiff; lower elongation; abrasive; drying 100 °C / 4–16 h
3DXTech CarbonX PC-CF	~15% CF	~140	—	US industrial line; ISO 9001; hardened nozzle mandatory

_{Table 15.2 — Re­in­forced PC com­pos­ites. The Ul­tra­fuse PC GF30 ten­sile-yield value of 36 MPa is no­table: it ap­pears lower than the un­filled PC Blend (~60 MPa) be­cause FDM-specific voids and weak inter-bead interfaces initiate failure before the material can yield — molded PC-GF30 is far stronger than unfilled PC — so the re­port­ed "yield" is ef­fec­tive­ly a printed break-strength value. Mod­u­lus and HDT are the rel­e­vant en­gi­neer­ing num­bers for these grades, not yield strength. Pick­ing GF30 for ten­sile ap­pli­ca­tions mis­reads the data.}

#### 15.5 ESD-safe PC

PC in its na­tive form is elec­tri­cal­ly in­su­lat­ing, with surface resistivity commonly on the order of 10¹⁵ Ohm/sq (use the current TDS for engineering decisions). For elec­tron­ics hous­ings, IC han­dling fix­tures, ESD-sen­si­tive workspace tool­ing, and cer­tain aero­space ap­pli­ca­tions, ESD-grade PC is com­pound­ed with con­duc­tive ad­di­tives (multi-wall car­bon nan­otubes or spe­cial­ty car­bon black) to drop the sur­face re­sis­tiv­i­ty into the elec­tro­stat­ic-dis­si­pa­tive target range, commonly about 10⁴–10⁹ Ohm/sq or a vendor-specific dissipative band.

Product	Conductive additive	Surface resistivity	HDT @ 0.45 MPa (°C)	Notes
3DXTech 3DXSTAT ESD-Safe PC	Conductive carbon (CNT-class)	104–109 Ohm/sq	135	Tg 143 °C; hardened nozzle mandatory; the consumer-tier ESD-PC default
Prusament PC Space Grade Black	Carbon-based additives (CNT-class)	ESD-dissipative range (TDS-published)	137.6	Specialty tier; published low-outgassing metrics; hardened nozzle required; price premium reflects qualification testing rather than performance step-up

_{Table 15.3 — ESD-safe PC fil­a­ments ac­ces­si­ble to con­sumer users. CNT-load­ed fil­a­ments are mildly abrasive — less so than chopped-fiber grades — but hardened nozzles are still recommended for production volumes; PCD or ruby noz­zle tips ex­tend ser­vice life on these ma­te­ri­als. The Prusa­ment Space Grade price pre­mi­um (~$269/kg vs ~$50/kg for the stan­dard PC Blend) is a pro­cure­ment de­ci­sion rather than a per­for­mance one — buy it for the doc­u­ment­ed out­gassing data, not the HDT.}

#### 15.6 Flame-retardant PC and PC/ABS-FR

For en­clo­sures near ig­ni­tion sources, elec­tron­ics hous­ings sub­ject to UL ap­proval, tran­sit and rail-ve­hi­cle ap­pli­ca­tions, and other safe­ty-crit­i­cal work. FR ad­di­tives — typ­i­cal­ly halo­gen-free phos­pho­rus-based or sul­fonate pack­ages — lower flamma­bil­i­ty rat­ings to UL94 V-0 (self-ex­tin­guish­ing with­in 10 sec­onds of flame re­moval, no flam­ing drips). The trade-off mat­ters: FR ad­di­tives often plas­ti­cize the poly­mer, low­er­ing T_g and HDT by 30–50 °C com­pared to pure PC.

Product	Class	FR rating	Tg(°C)	HDT @ 0.45 MPa (°C)	Notes
Forward AM Ultrafuse PC/ABS FR Black	PC/ABS + halogen-free FR	UL94 V-0; EN45545-2 R22/R23	94	89	Rail-vehicle certifications make this the procurement default for transit work
Spectrum PC/ABS FR V0	PC/ABS + halogen-free FR	UL94 V-0	—	— (HDT @ 1.8 MPa: 90)	Vicat 104 °C; print 240–265 °C; enclosure recommended for larger parts
Bambu PC FR	PC + FR (halogen content not disclosed)	UL94 V-0 (claim)	145	113	Highest Tg in the FR-PC category; FR additive package not detailed in TDS

_{Table 15.4 — Flame-re­tar­dant PC and PC/ABS fil­a­ments. The Tg spread (94 °C for Ul­tra­fuse vs 145 °C for Bambu PC FR) is the key en­gi­neer­ing sig­nal: the spread is driven first by the base polymer — Ultrafuse is a PC/ABS alloy while the Bambu product is a straight PC — and only secondarily by the FR chemistry; FR com­pli­ance and max­i­mum op­er­at­ing tem­per­a­ture remain com­pet­ing goals within a given base polymer. Pick by cer­ti­fi­ca­tion first (which stan­dard does your ap­pli­ca­tion re­quire?), then by ther­mal en­ve­lope.}

#### 15.7 PC/PTFE (low-friction wear surfaces)

PC ma­trix com­pound­ed with PTFE for low-fric­tion slid­ing sur­faces — bush­ings, guides, wear plates, me­chan­i­cal in­ter­faces where COF mat­ters. The PTFE phase low­ers the co­ef­fi­cient of fric­tion and the wear rate against it­self and against metal coun­ter­faces; the PC ma­trix car­ries the struc­tural load.

Spec­trum PC/PTFE is the most wide­ly avail­able com­mer­cial prod­uct in this niche, with HDT 140 °C (an­nealed) and tri­bo­log­i­cal met­rics pub­lished on the TDS. Print at 265–295 °C noz­zle, 90–120 °C bed, with cham­ber rec­om­mend­ed and Magi­goo PC ad­he­sive spec­i­fied by the man­u­fac­tur­er.

Ho­tend ma­te­ri­al con­straint. PTFE de­com­po­si­tion is a grad­ed process, not a sin­gle thresh­old: flu­o­ropoly­mer SDS data and NIOSH/Plas­tic­sEu­rope guid­ance de­scribe par­tic­u­late fume re­lease and poly­mer-fume-fever risk be­com­ing rel­e­vant around 300–350 °C, ac­tive py­rol­y­sis near 400 °C, and the more haz­ardous gases — hy­dro­gen flu­o­ride and car­bonyl flu­o­ride — ap­pear­ing at high­er tem­per­a­tures still, rough­ly 400 °C and above (see §5.3). PC/PTFE fil­a­ments process at 265–295 °C noz­zle — stay at the low end, since the margin to fume onset is minimal at the top of the range — which is still well above the safe tem­per­a­ture for PTFE-lined ho­tends (PTFE lin­ers soft­en and out­gas above ~240–250 °C even be­fore de­com­po­si­tion be­comes a con­cern). PC/PTFE print­ing re­quires an all-metal ho­tend with­out ex­cep­tion; this is the sin­gle most com­mon process-in­com­pat­i­bil­i­ty error on this fil­a­ment.

15.8 Consolidated property envelope

Across the four prod­uct cat­e­gories above, the prop­er­ty en­ve­lope spans a range wide enough that "PC" as a gener­ic spec is op­er­a­tional­ly mean­ing­less. The table below col­lects the head­line num­bers from each cat­e­go­ry for di­rect com­par­i­son.

Category	Tg range (°C)	HDT @ 0.45 MPa (°C)	Tensile (MPa)	Nozzle (°C)	Best for
General-purpose PC blend	105–150	95–145	40–65	260–290	Default engineering work, electronics enclosures, brackets to 100 °C service
PC-CF / PC-GF composite	142+	140	36–76	275–300	Stiff brackets, fixtures, jigs to 130 °C service; structural parts
ESD-PC	143	135–138	55–70	270–300	Electronics housings, IC handling, ESD-sensitive workspaces, space hardware
FR-PC / PC/ABS-FR	94–145	89–113	50–60	240–280	Safety-critical enclosures, transit/rail-certified parts, UL-rated electronics
PC/PTFE	—	140 (annealed)	55	265–295	Low-friction bushings, guides, wear surfaces; all-metal hotend required

_{Table 15.5 — PC fam­i­ly con­sol­i­dat­ed en­ve­lope. The Tg range col­umn cap­tures the sin­gle most con­se­quen­tial pro­cure­ment vari­able across the cat­e­go­ry: a 50 °C swing on Tg re­shapes the ser­vice-tem­per­a­ture en­ve­lope com­plete­ly. Spec­i­fy­ing "PC" with­out spec­i­fy­ing which sub-cat­e­go­ry is the most com­mon pro­cure­ment error in this poly­mer fam­i­ly — easy to make on a parts BOM, hard to re­cov­er from in a pro­duc­tion set­ting.}

#### 15.9 Print process and calibration

PC fam­i­ly pa­ram­e­ters vary more by sub-cat­e­go­ry than with­in any sin­gle one. The start­ing points below as­sume a 0.4 mm hard­ened-steel noz­zle (PC Blend tol­er­ates brass; ev­ery­thing fiber- or CNT-load­ed does not) and an en­closed build space.

Parameter	PC Blend	PC-CF / PC-GF	ESD-PC	FR-PC	PC/PTFE
Nozzle (°C)	270–290	275–300	270–300	240–280	265–295
Bed (°C)	100–115	100–115	110–120	90–110	90–120
Chamber	passive 40–50 °C	passive 40–50 °C	passive 45–60 °C	passive 40–50 °C	active 45–55 °C
Part cooling (%)	0–10	0	0	0–10	0
Max volumetric (mm3/s)	8–12	6–10	7–10	8–11	6–9
Pressure advance	0.025–0.05	0.035–0.06	0.030–0.05	0.030–0.05	0.030–0.05
Nozzle hardness	brass OK	hardened mandatory; PCD/ruby preferred	hardened mandatory; PCD/ruby preferred	brass OK; hardened on FR-CF variants	hardened recommended
Drying	80–100 °C, 6–8 h	90–110 °C, 8–10 h	80–100 °C, 6–8 h	60–80 °C, 4–16 h	80–100 °C, 6–8 h
Hotend type	all-metal	all-metal	all-metal	all-metal	all-metal only

_{Table 15.6 — PC fam­i­ly start­ing print pa­ram­e­ters. The ho­tend-type row is the most over­looked spec: PTFE-lined Bow­den-style ho­tends rated to 240 °C are ubiq­ui­tous on Tier 1 hard­ware and will out­gas or de­grade at PC pro­cess­ing tem­per­a­tures re­gard­less of noz­zle wear, be­fore any process tun­ing has a chance to mat­ter. Per-spool cal­i­bra­tion on the ac­tu­al ma­chine re­mains manda­to­ry; the val­ues above are poly­mer-chem­istry start­ing points.}

Mois­ture is the sec­ond-most-im­pact­ful vari­able. PC ab­sorbs 0.3–0.5% water at sat­u­ra­tion; PC-CF and PC-GF sub­stan­tial­ly more be­cause fiber sur­face area ac­cel­er­ates up­take. Mois­ture symp­toms: string­ing de­spite tuned re­trac­tion, sur­face rough­ness, au­di­ble "siz­zle" or pop­ping in the melt zone, and com­pro­mised in­ter­lay­er bond­ing. Ac­tive dry­ing be­fore every se­ri­ous print is the stan­dard for en­gi­neer­ing work; the Part I §3.5 dry­ing table spec­i­fies PC at 80–100 °C for 6–8 h and the re­in­forced grades at 90–110 °C for 8–10 h. Dry-box stor­age dur­ing print­ing ex­tends the print­able win­dow for opened spools.

15.10 Bed adhesion strategy

PC presents the op­po­site prob­lem from polypropy­lene: PC ad­heres too strong­ly to smooth PEI when prop­er­ly hot. The grip is suf­fi­cient to tear the spring steel sheet or pull PEI frag­ments away from the mag­net­ic sub­strate dur­ing part re­moval. Strat­e­gy de­pends on print vol­ume and how often the sur­face switch­es be­tween PC and other ma­te­ri­als.

Surface	PC compatibility	Adhesion strategy	Notes
Smooth PEI	Over-grips; sheet damage on removal	Glue stick, PVP coating, or Magigoo PC as release layer	Standard prosumer plate; release layer is non-negotiable for engineering parts
Textured PEI	Acceptable; reduced grip	Bare for small parts; Magigoo PC for larger	Less likely to damage on removal; cosmetic surface texture transfers to first layer

Surface	PC compatibility	Adhesion strategy	Notes
G10 garolite	Best long-term solution	Bare; bed 100–115 °C; cool fully before removal	Engineering default for repeated PC printing; zero adhesive residue; durable across many prints
CryoGrip Glacier	Documented compatibility at moderate bed temps	Bare; bed 90–100 °C	Frost-effect engineered sheet; cold-release on cool-down; lower bed temperatures than PEI
Glass / borosilicate	Marginal	Magigoo PC mandatory	Works but releases unpredictably; not the engineering choice
Polycarbonate sheet	Over-grips catastrophically	Do not use	PC-on-PC bonding is mechanically inseparable on cool-down

_{Table 15.7 — Bed ad­he­sion strate­gies for PC fam­i­ly ma­te­ri­als. G10 garo­lite is the en­gi­neer­ing de­fault for pro­duc­tion PC work be­cause its sur­face chem­istry grips PC dur­ing print­ing and re­leas­es clean­ly on cool-down with­out con­sum­able ad­he­sives — a work­flow ad­van­tage that com­pounds over many prints.}

The cost case for garo­lite is con­crete. Stan­dard spring-steel PEI plates dam­aged by over-grip dur­ing PC re­moval can­not be re­paired; re­place­ment runs $30–60 per sheet and is the dom­i­nant on­go­ing cost of run­ning PC on PEI with­out a re­lease layer.

15.11 Annealing

PC is amor­phous; an­neal­ing does not change crys­tallini­ty (there is none). What an­neal­ing does for PC is re­lieve resid­u­al stress from rapid layer cool­ing — use­ful for parts with thick walls, sharp cor­ners, or geo­met­ric stress con­cen­tra­tors where as-print­ed resid­u­al stress would oth­er­wise cause de­layed crack­ing. The di­men­sion­al cost is mod­est: typ­i­cal PC parts shrink 0.3–0.5% dur­ing a stress-re­lief an­neal.

Com­mon ven­dor sched­ules: Poly­Max PC 100 °C for 2 h; Bambu PC and PC FR 85–100 °C for 6–12 h. The tem­per­a­ture must stay below T_g by ~10–15 °C to avoid dis­tor­tion in thin walls — 100 °C is the prac­ti­cal upper bound for most con­sumer PC blends de­spite the T_g being 110–145 °C. Cool slow­ly (switch oven off, leave the part in­side until am­bi­ent) to avoid trap­ping new stress. The PC/PBT alloy (Poly­mak­er PC-PBT) is the ex­cep­tion: the PBT phase is semi-crys­talline and re­sponds to an­neal­ing sim­i­lar­ly to other semi-crys­talline poly­mers, with HDT and stiff­ness gains be­yond sim­ple stress re­lief. Sched­ule per the ven­dor TDS for that prod­uct specif­i­cal­ly.

15.12 Brand landscape (consumer-accessible)

The con­sumer-ac­ces­si­ble PC mar­ket clus­ters around eight ven­dors with well-doc­u­ment­ed en­gi­neer­ing-grade SKUs. Sealed-car­tridge in­dus­tri­al PC ma­te­ri­als (Strata­sys PC-ABS and PC-ESD, locked to For­tus/F-se­ries print­ers) are out of scope per the Part I §1.2 pro­sumer-tier fram­ing.

Brand	Catalog	Distinguishing notes
Prusament (Prusa Polymers)	PC Blend; PC Blend Carbon Fiber; PC Space Grade Black	Three-tier line from consumer engineering through space-qualified specialty; published printed-specimen data; the most-documented consumer PC brand

Brand	Catalog	Distinguishing notes
Bambu Lab	PC; PC FR	Tuned for reduced shrinkage; specifies chamber 45–60 °C; FR variant carries UL94 V-0 claim; mainstream consumer pricing
Polymaker	PolyMax PC; PolyLite PC; PC-ABS; PC-PBT	Engineered alloys with partner polymers named on the TDS for PC-ABS and PC-PBT; PolyMax PC is the unnamed alloy in the consumer tier
Forward AM (BASF)	Ultrafuse PC/ABS FR Black; Ultrafuse PC GF30	Rail-vehicle FR certification (EN45545-2) on the FR product; GF30 is the stiffest commonly-available PC composite at the consumer tier
3DXTech	3DXSTAT ESD-Safe PC; CarbonX PC-CF; ECO-PC FR (limited)	US industrial line; ISO 9001 manufacturing; ESD product is the consumer-tier ESD-PC default; price 1.5–2× consumer equivalents
Spectrum Filaments	PC CF; PC/PTFE; PC/ABS FR V0	European industrial line; the only consumer-accessible PC/PTFE product; halogen-free FR formulation
AzureFilm	PC-ABS	Budget tier; automotive positioning; published HDT 120 °C
Nanovia	PC family (PC-CF and PC-ABS variants)	French specialty manufacturer; product documentation requires distributor access; mechanical envelope places products in the engineering tier

_{Table 15.8 — Con­sumer-ac­ces­si­ble PC brand land­scape (early 2026). Prusa­ment, Bambu, and Poly­mak­er dom­i­nate con­sumer-tier shelves and ac­count for the ma­jor­i­ty of com­mu­ni­ty-shared print pro­files. For­ward AM Ul­tra­fuse and 3DX­Tech are the en­gi­neer­ing-qual­i­fi­ca­tion de­faults. Spec­trum's PC/PTFE is the only con­sumer ac­cess point for that spe­cif­ic com­pos­ite chem­istry. Brand cross-sub­sti­tu­tion with­in a sub-cat­e­go­ry (e.g., Prusa­ment PC Blend vs Bambu PC) is not free — the alloy part­ner dif­fers even when nei­ther brand names it, and the print­ed en­ve­lope can shift 10–20% on ten­sile and sub­stan­tial­ly more on Tg.}

#### 15.13 Application fit

Choose gen­er­al-pur­pose PC blend when: the part loads me­chan­i­cal­ly at ser­vice tem­per­a­tures 80–120 °C (en­gine-bay com­po­nents away from di­rect heat, elec­tron­ics hous­ings in warm en­vi­ron­ments, ma­chine guards near mo­tors); the selected PC blend's printed notched-impact performance is required and has been compared against PETG/PCTG on the same test basis; the part will be sol­vent-bond­ed or vapor-fin­ished (PC re­sponds well to di­chloro­meth­ane bond­ing for en­gi­neer­ing joints, with the han­dling caveats of §5.3); cost and print­abil­i­ty out­weigh the max­i­mum ther­mal en­ve­lope.

Choose PC-CF or PC-GF when: the part needs the stiff­ness of a metal-re­place­ment fil­a­ment with­out cross­ing into PPA ter­ri­to­ry on cost or process dis­ci­pline; HDT to 140 °C is re­quired; di­men­sion­al sta­bil­i­ty under load mat­ters more than im­pact tough­ness; the de­sign uses fiber-aligned ge­om­e­try where Z-strength is not the bind­ing con­straint. PA6-CF (Chap­ter 13) is the al­ter­na­tive if mois­ture is well-con­trolled and high­er im­pact tough­ness is need­ed; PPA-CF (Chap­ter 14) is the al­ter­na­tive if mois­ture is un­con­trolled or ser­vice tem­per­a­ture ex­ceeds PC's ceil­ing.

Choose ESD-PC when: the ap­pli­ca­tion re­quires sur­face re­sis­tiv­i­ty in the 10⁴–10⁹ Ohm/sq range, or the dissipative band specified by the applicable standard, with PC-class struc­tural per­for­mance — elec­tron­ics han­dling fix­tures, IC-test jigs, semi­con­duc­tor tool­ing. The Prusa­ment Space Grade prod­uct ad­di­tion­al­ly ad­dress­es vac­u­um-ser­vice out­gassing for space-hard­ware work.

Choose FR-PC when: cer­ti­fi­ca­tion (UL94 V-0, EN45545 for rail, equiv­a­lent for aero­space) is in scope. Pick by cer­ti­fi­ca­tion stan­dard first; the ther­mal en­ve­lope fol­lows.

Avoid the PC fam­i­ly when: the part loads out­doors for long du­ra­tions (BPA-PC yel­lows under UV; ASA is the right an­swer); food con­tact is in scope (BPA mi­gra­tion con­cerns; a copolyester — PCTG, or Tritan-based filament — is the alternative, subject to the §8.9 caveat that resin-level food-contact status does not transfer to printed parts); ser­vice tem­per­a­ture stays below 80 °C and im­pact tough­ness is not the bind­ing con­straint (PCTG saves 30–40% on fil­a­ment cost and prints more re­li­ably); the part re­quires fa­tigue re­sis­tance under cyclic load (PC notch-cracks; PA612 and PA11 from Chap­ter 13 re­tain duc­til­i­ty bet­ter).

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