Snap-on covers for TE 160783-7 (and other variants) boiler terminal connectors used in Gaggia espresso machines.

Materials:
Nylon (PA12) has been tested.

Ideal materials would be rated for ≥90° C continuous temp, with HDT of ≥135° C at 0.45 MPa, non-conductive. Be aware that the “same” material may differ by manufacturer. Nylon PA12, PA 66 GF30, PA 46, or Polycarbonate GF30 are potential options.

Printing: 
0.4 mm nozzle, 0.15-0.2 mm layer height, no supports. Other settings depend on the material.

Printing for PA12:
Many thanks to TomBrazier) for the testing, *.3mf files, printing write-up, and permission to quote it here.

See Loogle.v6.3mf and NylonBaseRaft.3mf.

• I used Fiberlogy PA12 filament. Fiberlogy PA12+GF also works with pretty much the same settings.
• Dry the filament before printing. This is not optional with the PA12 filament. The PA12+GF filament seems to be less moisture absorbent.
• I found it best to print a 0.2mm layer of PETG and then print the Nylon on top of that.
• 0.15mm layer height. (I tried 0.2mm but got much poorer inter-layer adhesion.)
• 2 perimeters. Use the Arachne perimeter generation engine if you have it to get optimal perimeter widths.
• 255°C nozzle, 85°C bed, no enclosure.
• Careful attention to cooling is needed: these parts will sag if there is insufficient cooling or insufficient time between layers. On the other hand the data sheet claims that PA12 warps if there is too much cooling. On my printer I found a minimum layer time of 7 seconds combined with a maximum cooling of 23% worked. I think less time and more cooling would have worked but my heated bed could not keep up to temperature with more than 23%. The perfect combination will result in nice straight vertical edges at the open end of the part.
• Printing multiple parts at once: this can help with minimum layer time. With the PA12+GF filament, however, it results in stringing. The plain PA12 was better in this regard. Loogle.v6.3mf above is set to print the parts sequentially, which is why they are so widely spaced. With plain PA12, I printed fairly clean parts with them more closely spaced and printed non-sequentially.