SLA

Stereolithography (SLA) ndiye ukadaulo wogwiritsa ntchito mwachangu kwambiri. Imatha kupanga mbali zolondola komanso zatsatanetsatane za polima. Inali njira yoyamba yowonera mwachangu, yomwe idayambitsidwa mu 1988 ndi 3D Systems, Inc., kutengera ntchito ya woyambitsa Charles Hull. Imagwiritsa ntchito laser yamphamvu yotsika, yolunjika kwambiri ya UV kuti ifufuze motsatizana magawo atatu amtundu wa chinthu chamitundu itatu mumtsuko wa polima wamadzimadzi. Pamene laser imatsata wosanjikiza, polima imalimba ndipo madera owonjezera amasiyidwa ngati madzi. Gawo likamalizidwa, tsamba lowongolera limasunthidwa pamwamba kuti lisalala musanayike gawo lina. Pulatifomu imatsitsidwa ndi mtunda wofanana ndi makulidwe osanjikiza (kawirikawiri 0.003-0.002 mkati), ndipo wosanjikiza wotsatira umapangidwa pamwamba pa zigawo zomwe zamalizidwa kale. Njira iyi yotsatirira ndi kusalaza imabwerezedwa mpaka kumanga kumalizidwa. Akamaliza, gawolo limakwezedwa pamwamba pa vat ndikutsanulidwa. Polima wowonjezera amatsukidwa kapena kuchapidwa kutali ndi pamwamba. Nthawi zambiri, machiritso omaliza amaperekedwa mwa kuika gawolo mu uvuni wa UV. Pambuyo pa kuchiritsa komaliza, zothandizira zimadulidwa gawolo ndipo malo amapukutidwa, opangidwa ndi mchenga kapena kumaliza.