We participated in the Maker Faire exhibition on 29. 03. 2025 in Karlovy Vary, held in the representative premises of the Spa Hotel Thermal. We presented the possibilities of thermography in 3D printing using mini IR cameras and mini computers with our own software for thermodiagnostics of 3D printing of plastics. Visitors had the opportunity to see live demonstrations of 3D printing of plastic parts through the eyes of IR cameras. Part of the presentation was focused on introducing the basic principles of non-contact temperature measurement and the difficulties that can be caused by external environment. Our exposition was part of the solution of the Czech-Bavarian project OPTHERM.