Remix from ClockworkPi's own cover with modifications:

• removed the four corner circular indents (messed up my print)
• removed outer bumps (no needed)
• removed clockwork text (it's inside man, unless you use tranparent filament, nobody is gonna ever see it)

Original files available here: https://www.clockworkpi.com/product-page/devterm-protective-cover-3d-model-in-stl-stp-format-free