HP ZBook 15 mouse nub

Coworker requested a replacement nub. Seemed fairly straightforward. Took me about an hour and 5 iterations to get perfect fit. Measuring soft rubber with a caliper is a wee bit hard.

Innermost square peg is 4x4mm, outerbit is 4.5x4.5mm. OD is 7.5mm, top OD is 8mm. The top concavity is from a sphere around 25mm R. Everything was done with simple bool add and subtract.

The blue is from when I had it 3.75mm tall, the green is the final 3.5mm tall.
Printed in tpu. Works as well as th