Tinker Cad can be found here. https://www.tinkercad.com/things/0tGItugXJ22-topper-plate?sharecode=QAEXrpYaafjViDjXBqDpUXlhi59WJtdJX4_vEcpLXmI
The author remixed this model.
Alternative top for this model Adds a roller with 608 bearings. You'll probably need to heat the roller and press the bearings in. Filament guide is held in with dove tails, This is a 1.0 and kind of sloppy file to just be a proof of concept.