The Bambu Lab A1 3D printer is a good intro into the world of 3D printing. It has a small build volume but its printing accuracy remains on par as its higher end Bambu Lab models. The A1 also differentiates from Bambu Lab's other 3D printers in that it is a bedslinger type 3D printer. The Combo version which has an AMS can print 4 different types of color filaments.
 
Full-auto Calibration
Multi-Color Printing (Combo Version)
Active Flow Rate Compensation
1-Clip Quick Swap Nozzle
Active Motor Noise Cancelling
256*256*256 mm³ Build Volume