Looks like the D-52 another victim to Mindark's crazy ways of making items and blueprints get completely devalued and find no more use.
Need 6 robot thermal sensors for each click of just one part needed to click the d52- 3 sales in the last year.
The B50 I happened to have Aumorphite (special recipe ore) on-hand and can sell for 250% (253% for the year - no sales since and 342% decade)
Or, I also made a uber tier for 400%
284, 1628, 917, 1529, 1818, 833, 1361, 1649, 582, 943
52tt btw