Heating control for 3D resin printers

prusaprinters

My Saturn 2 printer needs a heater due to the low temperatures in my workshop. Except in summer, the ambient temperatures are too low for the resin.I combined a PTC hot air heater with a VAT heater for printing.  The VAT and PTC heaters can be operated separately:The 1st switch controls the VAT heater only.The 2nd switch controls the fan and, when switched on, bridges the conductor to the 3rd switch. The fan thus runs continuously and forces the heat dissipation. To cool down, simply switch off the heater and let it run for a few minutes.The setup can be transferred to the respective 12V or 24V version of the STC-3008 as required.For the 220V version:Keep your hands off self-printed housings to hold the heating element. They get too hot for PETG!  Part list for the housingSTC-3008 2-way temp controller (I have the 220V version)3 rocker switch type KCD3 3440 220V 75W 80°C brewing belt (https://amzn.eu/d/htw3Zkb) adding a 40°C NC temperature switch for safety reasons (https://amzn.eu/d/erLhuXE) The temperature probe can be fixed to the VAT by the clamp made by SurfinBirdman:Saturn 2 Vat Handle Temp Probe Holder von SurfinBirdmanUse the risers for pressing the brewing belt to the VAT container or use some clamps which are also available for download.