FreeBaking Powder Submarine
Thingiverse
7 model
Free
FreeSimply Backing Z (A simple rear mount Z brace) 5/16th Version
Thingiverse
FreeSimply Backing Z (A simple rear mount Z brace) 3/8th Version
Thingiverse
FreeFloating Turtle Basking Platform
Thingiverse
FreeCreality-Hemera Aluminium Backing Plat
Thingiverse
FreeIMMS RFID Tag Backing
Thingiverse
FreeLMF12UU (convert your LM12UU Linear baring to Flange type)
Thingiverse