This lot of Mendel parts appeared on Ebay. The seller was in Ireland and they are cast in polyurethane rather than printed or machined.
Here's a closeup. the quality looks pretty good. Of course looks can be deceiving but I thought it was worth the risk so I threw in a bid just shy of $400.
They finally sold for $465 which is still a bit too rich for me. I am hoping the fact that they were cast rather than printed or machined means that the seller will be making more sets. This could finally start bringing the price down.
Hopefully whoever bought these will post something to let all of us potential buyers know what the quality is like.