I designed this to replace a lamp shade that cracked (probably IKEA). The critical part was the the bottom as it had to fit 2 notches in the lamp that hold it in place. Measured with a caliper and designed it to match the original part. Halted the first print early to make sure that the part fit correctly and notches matched.
Printed in PLA and have had it installed for almost 2 years. I'm using LED bulbs so no issues with heat melting the plastic.