Battlefront Miniatures has a 1/100 kit that makes either a Hetzer or a Marder. The kit sprue has all the parts necessary to make both a Hetzer and a Marder with the exception that it has only one set of tracks. I found a set of Hetzer tracks on the web. I used Tinkercad to remove the side armor and create an upper track run. I built mounting pegs to match the kit ones. Now you can use the extra parts in the kit to create a second vehicle. I printed mine with a resin printer and did not test on an FDM printer.

Anycubic

Photon

Yes

Yes

.05mm layer

100%

Siraya Fast UV Resin