The grey cutter was done on a better printer (my Prusa i3 MK3), the other on a Chinese machine I got on Ebay. Not only are the edges crisper but the vertical walls are not splitting down the center into two layers. The splitting happens because I use 0.9mm thickness for the walls (the extruder puts down a 0.45mm wide path so I get a quicker two-pass print). I print these same types of pieces on both printers using multiple filaments and the same slicer software. The better printer always produces better results.
Standard 3D printers (not clay 3D printers) are incredibly useful in ceramic production and design, bringing difficult processes within reach of potters and hobbyists.