Kenwood Chefette Lite Mixing Bowl Drive Ring

Update 11Apr24

This design has worked perfectly & has survived the dishwasher!

My son's Kenwood Chefette food mixer broke the ABS drive ring fitted to the top edge of the mixing bowl, which rendered it unusable. On inspection, it has cracked in several other places, all of them adjacent to the cutouts that accommodate fixing clips on the bowl. A replacement drive ring is only available with a stainless steel mixing bowl at about half the price of a new mixer, which is always an incentive for a 3d printing project!

I did a drawing in Onshape to the measurements I took from the old ring and sliced it in PrusaSlicer 2.7.1. The first print was too small and when I measured it, the inside diameter was 187mm and not the 190mm that I'd drawn. I looked again in PrusaSlicer, which showed that it had imported the stl with an inside diameter to be 187mm. I therefore increased the X and Y dimensions by 1.6% and printed again. This has fitted nicely to the top of the bowl - I can shake the bowl by the ring and it doesn't come loose. We haven't tried it with the mixer yet, which will have a few more vibration modes to add to the mix (no pun intended), because it's 100 miles (160km) from where I live!

The original drive ring is moulded in ABS, which I've never used, so I printed in ASA because the bowl needs to withstand the water temperature in a dish washer (and I already had some in white!). ABS has a glass transition temperature of about 105° Celsius, whereas ASA has a GTT close to this at about 100°C.

I have an Anycubic Kossel Linear Plus printer modified with a DUET 2 WiFi board (reprap firmware 3.4.6), E3D Titan extruder, ceramic heater, and borosilicate bed plate. I used a 0.5mm nozzle at 262°C, bed at 80°C with Elmer's purple glue, 0.2mm layer thickness, 6 vertical rings, 4 horizontal rings, 10% triangular infill, 16mm³ maximum volumetric flow (otherwise 100mm/s speed), and arc fitting enabled. The ring prints in it's “normal” orientation with the closed surface uppermost, and only needs supports under the 4 cut-outs around the inner edge of the ring. I drew these with the Prusaslicer paint-on-support tool and use organic supports.

Don't forget to check that your slicer imports the stl with an inner diameter of 190mm. 
If it doesn't, you'll need to adjust the model so that it has.