A little update from my MASM 3 Pro with added 38D1X, the MASM 5 A.
I've played around a bit with adding tubes right into the shell in Fusion 360 and that worked quite well. In the end though, I've settled with the shell from
@Aldo40 from page 885, which I modified to make the nozzle bigger so that I can fit 2x 2mm and 1x 1mm ID tubes quite nicely.
I've printed with black resin and used Lack 3 for the shell itself and for the faceplate I went with some nail polish with chameleon effect, covered with Lack 3.
All in all I'm very happy with the result and can recommend adding a 38D1X to the amazing MASM 3 Pro's.