I miss-aligned the slots in the base of my CleverDripper coffee maker while reassembling it after cleaning and snapped the stem of the valve mechanism clean off.
Fortunately I could position the bits correctly to attempt a repair with a UV liquid plastic welder.
Work in layers, apply liquid pastic to the repair area then cure it in 8 seconds with a UV LED. Add more layers, curing each with UV light before reapplying.
All done, fixed & working in 10 minutes.