Gridfinity seems very useful. I might try it. I spent $100 on FB marketplace 2 years ago for a AnkerMake M5C with bunch of rolls of PLA. I've printed hairdryer rack, containers, Labubus as little gifts for neighborhood kids to paint over. I thought about getting a multi-color 3d printer like Anycubic Kobra S1 combo, but the wasting of plastics is holding me back. Snapmaker U1 is much better but more expensive.