Adopted @PleaseHelp model on onshape a bit to match the measurements of the original cap, added some chamfers and fillets. Best printed in PETG, PP or something similair.
The Onshape model can be accessed here:
https://cad.onshape.com/documents/991896fc33fe73ad23a140bc/w/9edf20fd8ff037306a0eaab5/e/0f3b4b5a0b2c327eea71f6e3
The author remixed this model.