Store the mains and 12v car adaptors for your Anker Powerhouse 521 directly on the units rear panel - no danger of misplacing or forgetting them. There are slots for 10mm strips of velcro to secure the adaptors if needed, and space for a USB cable.
6 push pins mount the organiser into the screw holes, and it can be easily removed when not required.
The part prints without supports. Recommend PETG.
Your printer will need to be accurate to within 0.5mm for the overall size, otherwise the mounting pins will not line up correctly.
I only have a UK mains adapter, so I can't test the fit for other plug types - any issues please do leave a comment…
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