Hi @dlott91 ,
Where is the plastic broken. in the lid or the bottom case?
If it is in the bottom case it might be better in the long term to replace the [https://www.ebay.com/itm/Acer-Aspire-E5-575-33BM-15-6-Laptop-Bottom-Case-W-Cover-Door-EAZAA004010/143281113609?epid=773229751&hash=item215c384a09:g:8ycAAOSw9Mtc1J33|bottom case -example only]
If it is the lid, I cannot find a lid specific to your model (or even just an E5 575) where the price is not exorbitant. You may have better luck.
If you do decide to go for a replacement, here’s a [https://www.youtube.com/watch?v=fNQtlfcte3Q|video] that shows how to replace the hinges that may be of some help.
As an aside you may find this [https://community.acer.com/en/discussion/536719/hinge-issue-on-aspire-e-15-e5-575-33bm|link] to be of interest.