Fairly imporant, in my opinion, tip. If you have a printer that has printed parts. Print spares. Of everything.
Of course breaking a part may lead you to make something better if you have the stuff to do it but still have spares.
Case in point, my Z axis end stop broke. It's hard to zero a printer when the thing that tells it when to stop is broken. I tried gluing back it together, no go. I tried heating and smushing backing together. No go.
But I had some 1/8" by 1/2" bar stock so bent one end at 90 degree angle of about the right length. I then cut it off at the right overall length.
I drilled and tapped a m5x8 hole in the short section and two 1/4" holes in the long section that matched up with the pieces of the printed part.
A little grinding on a bench grinder to put the necessary screw relief in place and I'm back in business.
I'm printing a couple of spares now but I don't know yet if I'll leave the steel one in place or swap it out with a printed one.
I'm also printing them with 3 shells, layers and 50% infill in PETG. The original seems to have been 2 and 10% and in ABS. Not the strongest print in the world.
Anyway, if there are breakable parts on your printer then have spares. It'll save you some grief.