I’m itching to get out in the shop and make something, so this is just a teaser image until I can write up a long post and show the caliper measurements etc. Suffice it to say I’m very impressed and the pieces are perfectly smooth and very accurate! Ask away if you have questions.
If you want to try milling or 3D printing something for your shop or one of your other hobbies, you can still get the USD$50 credit towards your first project by signing up at Xometry here: https://mbsy.co/BWNW9 and feel free to share that link with friends but please don’t abuse it.
By way of comparison, this 3.5"x3.5" x .75" piece of milled aircraft grade aluminum was about USD$32/ea in a qty of 3. I think it was still <$40 if I only ordered one, but I can’t recall for sure. It was affordable enough that I bought one or two more as gifts. 
I’m hoping to try it out later this week, but may be delayed due to Halloween. More soon.
-Jeff
PS - it is dead square as expected.
